Merge branch 'fix-unc-buffer-overflow'

This fixes `git status` in a Git worktree at the top of a file share.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

setup.c

@@ -763,7 +763,7 @@ static const char *setup_discovered_git_dir(const char *gitdir,
 		set_git_dir(gitdir);
 	inside_git_dir = 0;
 	inside_work_tree = 1;
-	if (offset == cwd->len)
+	if (offset >= cwd->len)
 		return NULL;
 
 	/* Make "offset" point past the '/' (already the case for root dirs) */