bluray: Check for read error when menu are enabled.

This fixes crash with BD-J menu, if libbluray isn't built with java
support.
(cherry picked from commit 3bc5c401996090ef409d0c76fd59c1d009b80c00)
(cherry picked from commit 96b0289176abe5a24eb1f854e74654b3c55d0574)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/access/bluray.c

@@ -1000,6 +1000,11 @@ static int blurayDemux(demux_t *p_demux)
         BD_EVENT e;
         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");