file_exists(): dangling symlinks do exist

This function is used to see if a path given by the user does exist
on the filesystem.  A symbolic link that does not point anywhere does
exist but running stat() on it would yield an error, and it incorrectly
said it does not exist.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

dir.c

@@ -690,11 +690,10 @@ int read_directory(struct dir_struct *dir, const char *path, const char *base, i
 	return dir->nr;
 }
 
-int
-file_exists(const char *f)
+int file_exists(const char *f)
 {
 	struct stat sb;
-  return stat(f, &sb) == 0;
+	return lstat(f, &sb) == 0;
 }
 
 /*