smb: Use loff_t for directory position in cached_dirents

Change the pos field in struct cached_dirents from int to loff_t
to support large directory offsets. This avoids overflow and
matches kernel conventions for directory positions.

Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Signed-off-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/cached_dir.h

@@ -26,7 +26,7 @@ struct cached_dirents {
 			    * open file instance.
 			    */
 	struct mutex de_mutex;
-	int pos;		 /* Expected ctx->pos */
+	loff_t pos;		 /* Expected ctx->pos */
 	struct list_head entries;
 };