Merged revisions 313142 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r313142 | may | 2011-04-10 00:56:17 +0400 (Sun, 10 Apr 2011) | 3 lines
  
  fix trivial bug in ooh323_indicate on AST_CONTROL_SRC...
  check p->rtp is not null
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@313143 65c4cc65-6c06-0410-ace0-fbb531ad65f3

addons/chan_ooh323.c

@@ -1259,10 +1259,14 @@ static int ooh323_indicate(struct ast_channel *ast, int condition, const void *d
 		}
 	 break;
 	case AST_CONTROL_SRCUPDATE:
-		ast_rtp_instance_update_source(p->rtp);
+		if (p->rtp) {
+			ast_rtp_instance_update_source(p->rtp);
+		}
 		break;
 	case AST_CONTROL_SRCCHANGE:
-		ast_rtp_instance_change_source(p->rtp);
+		if (p->rtp) {
+			ast_rtp_instance_change_source(p->rtp);
+		}
 		break;
 	case AST_CONTROL_CONNECTED_LINE:
 		if (!ast->connected.id.name.valid