interface: remove faulty assert() to make weston happy at runtime

This was removed after a discussion on IRC with the weston guys
('daniels' on irc.freenode.net/#wayland).

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
---
Upstream status: no, will be pushed by weston guys later.
If not, I'll do it.

diff -durN rpi-userland-77d32cd.orig/interface/vmcs_host/vc_vchi_dispmanx.c rpi-userland-77d32cd/interface/vmcs_host/vc_vchi_dispmanx.c
--- rpi-userland-77d32cd.orig/interface/vmcs_host/vc_vchi_dispmanx.c	2013-10-04 17:43:44.000000000 +0200
+++ rpi-userland-77d32cd/interface/vmcs_host/vc_vchi_dispmanx.c	2013-10-08 22:28:51.611433539 +0200
@@ -1187,7 +1187,6 @@
          continue;
    
       if(dispmanx_client.update_callback ) {
-         vcos_assert( dispmanx_client.pending_update_handle == (DISPMANX_UPDATE_HANDLE_T) dispmanx_client.notify_buffer[1]);
          dispmanx_client.update_callback((DISPMANX_UPDATE_HANDLE_T) dispmanx_client.notify_buffer[1], dispmanx_client.update_callback_param);
       }
    }