[PATCH] dir.c: avoid stat() in valid_cached_dir()

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

stat() may follow a symlink and return stat data of the link's target
instead of the link itself. We are concerned about the link itself.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 I noticed this while looking at the untracked cache bug [1] but
 because it's not directly related to that bug, I'm submitting it
 separately here.

 [1] https://public-inbox.org/git/CACsJy8AmbKSp0mDLRaDCWn45veeNc03B-Gq8r8PQPrDt9bM_EA@mail.gmail.com/

 dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dir.c b/dir.c
index 7c4b45e30e..edcb7bb462 100644
--- a/dir.c
+++ b/dir.c
@@ -1809,7 +1809,7 @@ static int valid_cached_dir(struct dir_struct *dir,
 	 */
 	refresh_fsmonitor(istate);
 	if (!(dir->untracked->use_fsmonitor && untracked->valid)) {
-		if (stat(path->len ? path->buf : ".", &st)) {
+		if (lstat(path->len ? path->buf : ".", &st)) {
 			invalidate_directory(dir->untracked, untracked);
 			memset(&untracked->stat_data, 0, sizeof(untracked->stat_data));
 			return 0;
-- 
2.15.0.320.g0453912d77