sdl: sdl.go: Add errorFromInt() helper function

Signed-off-by: Lilis Iskandar <[email protected]>

Author: veeableful

sdl/sdl.go

@@ -142,3 +142,11 @@ func WasInit(flags uint32) uint32 {
 func GetPlatform() string {
 	return string(C.GoString(C.SDL_GetPlatform()))
 }
+
+// errorFromInt returns GetError() if passed negative value, otherwise it returns nil.
+func errorFromInt(code int) error {
+	if code < 0 {
+		return GetError()
+	}
+	return nil
+}