Enhance github helper scripts (#9887)

buildroot/share/git/mffp

@@ -6,7 +6,7 @@
 # By default: `git push upstream HEAD:bugfix-1.1.x`
 #
 
-[[ $# < 3 ]] || { echo "Usage: `basename $0` [1|2] [commit-id]" 1>&2 ; exit 1; }
+[[ $# < 3 && $1 != "-h" && $1 != "--help" ]] || { echo "Usage: `basename $0` [1|2] [commit-id]" 1>&2 ; exit 1; }
 
 if [[ $1 == '1' || $1 == '2' ]]; then
   MFINFO=$(mfinfo "$1") || exit 1