generate-cmdlist.sh: replace for loop by printf's auto-repeat feature

This is just a small code reduction. There is a small probability that
the new code breaks when the category list is empty. But that would be
noticed during the compile step.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

generate-cmdlist.sh

@@ -67,10 +67,7 @@ print_command_list () {
 	while read cmd rest
 	do
 		printf "	{ \"$cmd\", $(get_synopsis $cmd), 0"
-		for cat in $(echo "$rest" | get_category_line)
-		do
-			printf " | CAT_$cat"
-		done
+		printf " | CAT_%s" $(echo "$rest" | get_category_line)
 		echo " },"
 	done
 	echo "};"