Address linter issue (#3555)

Author: raphael

codegen/example/templates/server_handler.go.tpl

@@ -50,5 +50,5 @@
 	{{ end }}
 {{- end }}
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: {{ join .Server.AvailableHosts "|" }})\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: {{ join .Server.AvailableHosts "|" }})", *hostF))
 	}	

codegen/example/testdata/server-no-server.golden

@@ -109,7 +109,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-same-api-service-name.golden

@@ -109,7 +109,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-sercice-for-only-grpc.golden

@@ -85,7 +85,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-server-hosting-multiple-services.golden

@@ -115,7 +115,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-server-hosting-service-subset.golden

@@ -109,7 +109,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-server-hosting-service-with-file-server.golden

@@ -65,7 +65,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: svc)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: svc)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-service-for-http-and-part-of-grpc.golden

@@ -115,7 +115,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-service-for-only-http.golden

@@ -84,7 +84,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: localhost)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-service-name-with-spaces.golden

@@ -109,7 +109,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: svc)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: svc)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-single-server-multiple-hosts-with-variables.golden

@@ -127,7 +127,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev|stage)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev|stage)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-single-server-multiple-hosts.golden

@@ -109,7 +109,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev|stage)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev|stage)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-single-server-single-host-with-variables.golden

@@ -135,7 +135,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)", *hostF))
 	}
 
 	// Wait for signal.

codegen/example/testdata/server-single-server-single-host.golden

@@ -157,7 +157,7 @@ func main() {
 		}
 
 	default:
-		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)\n", *hostF))
+		log.Fatal(ctx, fmt.Errorf("invalid host argument: %q (valid hosts: dev)", *hostF))
 	}
 
 	// Wait for signal.