netfs: Fix a KMSAN uninit-value error in netfs_clear_buffer

Use folioq_count instead of folioq_nr_slots to fix a KMSAN uninit-value
error in netfs_clear_buffer

Signed-off-by: Chang Yu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Fixes: cd0277e ("netfs: Use new folio_queue data type and iterator instead of xarray iter")
Acked-by: David Howells <[email protected]>
Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=921873345a95f4dae7e9
Signed-off-by: Christian Brauner <[email protected]>

Author: ChangMarkusYu

fs/netfs/misc.c

@@ -102,7 +102,7 @@ void netfs_clear_buffer(struct netfs_io_request *rreq)
 
 	while ((p = rreq->buffer)) {
 		rreq->buffer = p->next;
-		for (int slot = 0; slot < folioq_nr_slots(p); slot++) {
+		for (int slot = 0; slot < folioq_count(p); slot++) {
 			struct folio *folio = folioq_folio(p, slot);
 			if (!folio)
 				continue;