libceph: fix return value check in alloc_msg_with_page_vector()

In case of error, the function ceph_alloc_page_vector() returns
ERR_PTR() and never returns NULL. The NULL test in the return value
check should be replaced with IS_ERR().

Fixes: 1907920324f1 ('libceph: support for sending notifies')
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index b5ec096..a97e7b5 100644 (file)
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -4220,7 +4220,7 @@ static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
 
                pages = ceph_alloc_page_vector(calc_pages_for(0, data_len),
                                               GFP_NOIO);
-               if (!pages) {
+               if (IS_ERR(pages)) {
                        ceph_msg_put(m);
                        return NULL;
                }