makefile: added uncrustify target for code format

Author: udrechsler

.Makefile.mk

@@ -132,14 +132,14 @@ HELP_check-uncrustify = check if formatting code with uncrustify is necessary
 check-uncrustify: | check-docker
 	@make --no-print-directory -C $(DOCKERDIR) uncrustify \
 	EXEC="git ls-files -ico $(foreach PATTERN,$(FORMAT),-x $(PATTERN)) \
-	      | xargs -I % sh -c 'uncrustify -c $(UNCRUSTIFY_CFG) -f % \
-	                          | git -c color.diff.new='normal 22' \
-	                                -c color.diff.old='normal 88' \
+	      | xargs -I % sh -c \"uncrustify -c $(UNCRUSTIFY_CFG) -f % \
+	                          | git -c color.diff.new=normal\\ 22 \
+	                                -c color.diff.old=normal\\ 88 \
 	                                diff --exit-code \
 	                                     --no-index \
 	                                     --color \
 	                                     --word-diff=color \
-	                                     --word-diff-regex=. % - '" 
+	                                     --word-diff-regex=. % - \""
 
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