macosx: fixed crash when video output stops

modules/gui/macosx/vout.m

 /*****************************************************************************
  * vout.m: MacOS X video output module
  *****************************************************************************
- * Copyright (C) 2001-2009 the VideoLAN team
+ * Copyright (C) 2001-2011 the VideoLAN team
  * $Id$
  *
  * Authors: Colin Delacroix <colin@zoy.org>
@@ -178,7 +178,7 @@ int DeviceCallback( vlc_object_t *p_this, const char *psz_variable,
 
     if( [o_screens count] <= 0 )
     {
-        msg_Err( p_vout, "no OSX screens available" );
+        msg_Err( VLCIntf, "no OSX screens available" );
         return NO;
     }
 
@@ -506,7 +506,8 @@ int DeviceCallback( vlc_object_t *p_this, const char *psz_variable,
                 val.i_int |= (int)CocoaKeyToVLC( key );
             var_Set( p_vout->p_libvlc, "key-pressed", val );
         }
-        else msg_Warn( p_vout, "could not send keyevent to VLC core" );
+        else
+            msg_Dbg( VLCIntf, "could not send keyevent to VLC core" );
     }
     else
         [super keyDown: o_event];