/ fixes possibility for accessing of struct when null

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5896 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_vpb.c

@@ -1149,10 +1149,15 @@ static inline int monitor_handle_notowned(struct vpb_pvt *p, VPB_EVENT *e)
 				}
 			} else if (e->data == p->ring_timer_id) {
 				/* We didnt get another ring in time! */
+				if (p->owner){
 					if (p->owner->_state != AST_STATE_UP)  {
 						 /* Assume caller has hung up */
 						vpb_timer_stop(p->ring_timer);
 					}
+				} else {
+					 /* No owner any more, Assume caller has hung up */
+					vpb_timer_stop(p->ring_timer);
+				}
 			} 
 			break;
 
@@ -2247,12 +2252,12 @@ static int vpb_write(struct ast_channel *ast, struct ast_frame *frame)
 		gettimeofday(&play_buf_time_finish,NULL);
 		if (play_buf_time_finish.tv_sec == play_buf_time_start.tv_sec){
 			p->play_buf_time=(int)((play_buf_time_finish.tv_usec-play_buf_time_start.tv_usec)/1000);
-/*		ast_log(LOG_DEBUG, "%s: vpb_write: Timing start(%d) finish(%d)\n", p->dev,play_buf_time_start.tv_usec,play_buf_time_finish.tv_usec); */
+	/*		ast_log(LOG_DEBUG, "%s: vpb_write: Timing start(%d) finish(%d)\n", p->dev,play_buf_time_start.tv_usec,play_buf_time_finish.tv_usec); */
 		}
 		else {
 			p->play_buf_time=(int)((play_buf_time_finish.tv_sec - play_buf_time_start.tv_sec)*100)+(int)((play_buf_time_finish.tv_usec-play_buf_time_start.tv_usec)/1000);
 		}
-/*	ast_log(LOG_DEBUG, "%s: vpb_write: Wrote data [%d](%d=>%s) to play_buf in [%d]ms..\n", p->dev,frame->datalen,fmt,ast2vpbformatname(frame->subclass),p->play_buf_time); */
+	/*	ast_log(LOG_DEBUG, "%s: vpb_write: Wrote data [%d](%d=>%s) to play_buf in [%d]ms..\n", p->dev,frame->datalen,fmt,ast2vpbformatname(frame->subclass),p->play_buf_time); */
 	}
 	else {
 		p->chuck_count++;