worktree: initialize return value for submodule_uses_worktrees

When the worktrees directory is empty, the `ret` will be returned
uninitialized. Fix it by initializing the value.

Signed-off-by: Stefan Beller <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: stefanbeller

worktree.c

@@ -387,7 +387,7 @@ int submodule_uses_worktrees(const char *path)
 	struct strbuf sb = STRBUF_INIT;
 	DIR *dir;
 	struct dirent *d;
-	int ret;
+	int ret = 0;
 	struct repository_format format;
 
 	submodule_gitdir = git_pathdup_submodule(path, "%s", "");