bluray: Fix a memory leak introduced in previous commit.

modules/access/bluray.c

@@ -1001,7 +1001,10 @@ static int blurayDemux(demux_t *p_demux)
         nread = bd_read_ext(p_sys->bluray, p_block->p_buffer,
                             NB_TS_PACKETS * BD_TS_PACKET_SIZE, &e);
         if (nread < 0)
+        {
+            block_Release(p_block);
             return -1;
+        }
         if (nread == 0) {
             if (e.event == BD_EVENT_NONE)
                 msg_Info(p_demux, "We reached the end of a title");