contrib: support trailing commas in sbctl setup output

Author: behrmann

contrib/kernel-install/91-sbctl.install

@@ -31,7 +31,7 @@ add)
 
 	# exit without error if keys don't exist
 	# https://github.com/Foxboron/sbctl/issues/187
-	if ! [ "$(sbctl setup --print-state --json | grep installed | awk '{print $2}')" = "true" ]; then
+	if ! [ "$(sbctl setup --print-state --json | awk '/installed/ { gsub(/,$/,"",$2); print $2 }')" = "true" ]; then
 		echo "Secureboot key directory doesn't exist, not signing!"
 		exit 0
 	fi