git-submodule.sh - Remove trailing / from URL if found

git clone does not complain if a trailing '/' is included in the origin
URL, but doing so causes resolution of a submodule's URL relative to the
superproject to fail. Regardless of whether git is changed to remove the
trailing / before recording the URL, we should avoid this issue in
submodule as existing repositories can have this problem.

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -35,7 +35,7 @@ resolve_relative_url ()
 	remote="${remote:-origin}"
 	remoteurl=$(git config "remote.$remote.url") ||
 		die "remote ($remote) does not have a url defined in .git/config"
-	url="$1"
+	url="${1%/}"
 	while test -n "$url"
 	do
 		case "$url" in