fstree: replace lstat with stat

Fixes mingw cross-compilation. lstat() doesn't exist on win32.

It seems to me that stat() is the right function there, to return
informations about the file it refers to.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20191009102025.10179-7-marcandre.lureau@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

fstree.c

@@ -30,7 +30,7 @@ static struct node *read_fstree(const char *dirname)
 
 		tmpname = join_path(dirname, de->d_name);
 
-		if (lstat(tmpname, &st) < 0)
+		if (stat(tmpname, &st) < 0)
 			die("stat(%s): %s\n", tmpname, strerror(errno));
 
 		if (S_ISREG(st.st_mode)) {