submodule add: clean up duplicated code

In cmd_add() the switch statement used to resolve a relative url was
present twice. Remove the second one and use the realrepo variable set
by the first one (lines 194 ff.) instead.

Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -238,15 +238,7 @@ cmd_add()
 			die "'$path' already exists and is not a valid git repo"
 		fi
 
-		case "$repo" in
-		./*|../*)
-			url=$(resolve_relative_url "$repo") || exit
-		    ;;
-		*)
-			url="$repo"
-			;;
-		esac
-		git config submodule."$path".url "$url"
+		git config submodule."$path".url "$realrepo"
 	else
 
 		module_clone "$path" "$realrepo" "$reference" || exit