Don't crash when parking a non-bridged call.

(closes issue #17680)
Reported by: jmhunter
Patches: 
      chan_skinny-park-v1.txt uploaded by DEA (license 3)
Tested by: jmhunter, DEA


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@287642 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_skinny.c

@@ -4894,6 +4894,7 @@ static int handle_stimulus_message(struct skinny_req *req, struct skinnysession
 
 		if ((sub && sub->owner) && (sub->owner->_state ==  AST_STATE_UP)){
 			c = sub->owner;
+			if (ast_bridged_channel(c)) {
 				if (!ast_masq_park_call(ast_bridged_channel(c), c, 0, &extout)) {
 					snprintf(message, sizeof(message), "Call Parked at: %d", extout);
 					transmit_displaynotify(d, message, 10);
@@ -4903,8 +4904,11 @@ static int handle_stimulus_message(struct skinny_req *req, struct skinnysession
 			} else {
 				transmit_displaynotify(d, "Call Park not available", 10);
 			}
+		} else {
+			transmit_displaynotify(d, "Call Park not available", 10);
 		}
 		break;
+		}
 	case STIMULUS_DND:
 		if (skinnydebug)
 			ast_verb(1, "Received Stimulus: DND (%d/%d)\n", instance, callreference);
@@ -5984,6 +5988,7 @@ static int handle_soft_key_event_message(struct skinny_req *req, struct skinnyse
 
 		if ((sub && sub->owner) && (sub->owner->_state ==  AST_STATE_UP)){
 			c = sub->owner;
+			if (ast_bridged_channel(c)) {
 				if (!ast_masq_park_call(ast_bridged_channel(c), c, 0, &extout)) {
 					snprintf(message, sizeof(message), "Call Parked at: %d", extout);
 					transmit_displaynotify(d, message, 10);
@@ -5993,8 +5998,11 @@ static int handle_soft_key_event_message(struct skinny_req *req, struct skinnyse
 			} else {
 				transmit_displaynotify(d, "Call Park not available", 10);
 			}
+		} else {
+			transmit_displaynotify(d, "Call Park not available", 10);
 		}
 		break;
+		}
 	case SOFTKEY_JOIN:
 		if (skinnydebug)
 			ast_verb(1, "Received Softkey Event: Join(%d/%d)\n", instance, callreference);