smb: client: change smbd_deregister_mr() to return void

No callers checks the return value and this makes further
changes easier.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: metze-samba

fs/smb/client/smbdirect.c

@@ -2612,7 +2612,7 @@ static void local_inv_done(struct ib_cq *cq, struct ib_wc *wc)
  * and we have to locally invalidate the buffer to prevent data is being
  * modified by remote peer after upper layer consumes it
  */
-int smbd_deregister_mr(struct smbdirect_mr_io *smbdirect_mr)
+void smbd_deregister_mr(struct smbdirect_mr_io *smbdirect_mr)
 {
 	struct ib_send_wr *wr;
 	struct smbdirect_socket *sc = smbdirect_mr->socket;
@@ -2662,8 +2662,6 @@ int smbd_deregister_mr(struct smbdirect_mr_io *smbdirect_mr)
 done:
 	if (atomic_dec_and_test(&sc->mr_io.used.count))
 		wake_up(&sc->mr_io.cleanup.wait_queue);
-
-	return rc;
 }
 
 static bool smb_set_sge(struct smb_extract_to_rdma *rdma,

fs/smb/client/smbdirect.h

@@ -60,7 +60,7 @@ int smbd_send(struct TCP_Server_Info *server,
 struct smbdirect_mr_io *smbd_register_mr(
 	struct smbd_connection *info, struct iov_iter *iter,
 	bool writing, bool need_invalidate);
-int smbd_deregister_mr(struct smbdirect_mr_io *mr);
+void smbd_deregister_mr(struct smbdirect_mr_io *mr);
 
 #else
 #define cifs_rdma_enabled(server)	0