libceph: kfree() in put_osd() shouldn't depend on authorizer

commit b28ec2f3 upstream.

a255651d ("ceph: ensure auth ops are defined before use") made
kfree() in put_osd() conditional on the authorizer.  A mechanical
mistake most likely - fix it.

Cc: Alex Elder <elder@linaro.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

net/ceph/osd_client.c

@@ -993,10 +993,11 @@ static void put_osd(struct ceph_osd *osd)
 {
 	dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 	     atomic_read(&osd->o_ref) - 1);
-	if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
+	if (atomic_dec_and_test(&osd->o_ref)) {
 		struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 
-		ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
+		if (osd->o_auth.authorizer)
+			ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
 		kfree(osd);
 	}
 }