ceph: fix a wrong comparison

A negative value rc compared to the positive value ENOENT in the
finish_read() function.
Signed-off-by: NAnton Protopopov <a.s.protopopov@gmail.com>
Signed-off-by: NYan, Zheng <zyan@redhat.com>

fs/ceph/addr.c

@@ -276,7 +276,7 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
 	for (i = 0; i < num_pages; i++) {
 		struct page *page = osd_data->pages[i];
 
-		if (rc < 0 && rc != ENOENT)
+		if (rc < 0 && rc != -ENOENT)
 			goto unlock;
 		if (bytes < (int)PAGE_CACHE_SIZE) {
 			/* zero (remainder of) page */