io_uring/net: checks errors of zc mem accounting

mm_account_pinned_pages() may fail, don't ignore the return value.

Fixes: e29e3bd4 ("io_uring: account locked pages for non-fixed zc")
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/dae0542ed8e6706071bb83ad3e7ad6a70d207fd9.1658742118.git.asml.silence@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

io_uring/net.c

@@ -985,7 +985,9 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
 					  &msg.msg_iter);
 		if (unlikely(ret))
 			return ret;
-		mm_account_pinned_pages(&notif->uarg.mmp, zc->len);
+		ret = mm_account_pinned_pages(&notif->uarg.mmp, zc->len);
+		if (unlikely(ret))
+			return ret;
 	}
 
 	if (zc->addr) {