io_uring/zcrx: don't leak pages on account failure

Someone needs to release pinned pages in io_import_umem() if accounting
fails. Assign them to the area but return an error, the following
io_zcrx_free_area() will clean them up.

Fixes: 262ab20 ("io_uring/zcrx: account area memory")
Signed-off-by: Pavel Begunkov <[email protected]>
Link: https://lore.kernel.org/r/e19f283a912f200c0d427e376cb789fc3f3d69bc.1753091564.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <[email protected]>

Author: isilence

io_uring/zcrx.c

@@ -199,15 +199,13 @@ static int io_import_umem(struct io_zcrx_ifq *ifq,
 
 	mem->account_pages = io_count_account_pages(pages, nr_pages);
 	ret = io_account_mem(ifq->ctx, mem->account_pages);
-	if (ret < 0) {
+	if (ret < 0)
 		mem->account_pages = 0;
-		return ret;
-	}
 
 	mem->pages = pages;
 	mem->nr_folios = nr_pages;
 	mem->size = area_reg->len;
-	return 0;
+	return ret;
 }
 
 static void io_release_area_mem(struct io_zcrx_mem *mem)