git-submodule.sh: remove duplicate call to set_rev_name

set_rev_name is a possiblly expensive operation. If a submodule has
changes in it, set_rev_name was called twice.

Move call to set_rev_name so it's only called once, no matter which
codepath is taken.

Signed-off-by: Fredrik Gustafsson <iveqy@iveqy.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -1129,16 +1129,16 @@ cmd_status()
 			say "-$sha1 $displaypath"
 			continue;
 		fi
-		set_name_rev "$sm_path" "$sha1"
 		if git diff-files --ignore-submodules=dirty --quiet -- "$sm_path"
 		then
+			set_name_rev "$sm_path" "$sha1"
 			say " $sha1 $displaypath$revname"
 		else
 			if test -z "$cached"
 			then
 				sha1=$(clear_local_git_env; cd "$sm_path" && git rev-parse --verify HEAD)
-				set_name_rev "$sm_path" "$sha1"
 			fi
+			set_name_rev "$sm_path" "$sha1"
 			say "+$sha1 $displaypath$revname"
 		fi