don't leak on xferext ivr event, CID:1214232 Resource leak

src/switch_ivr.c

@@ -696,6 +696,7 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_parse_event(switch_core_session_t *se
 			
 			if (!strcasecmp(hp->name, "application")) {
 				app = strdup(hp->value);
+				if (app) {
 					data = strchr(app, ' ');
 
 					if (data) {
@@ -703,6 +704,8 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_parse_event(switch_core_session_t *se
 					}
 
 					switch_caller_extension_add_application(session, extension, app, data);
+					free(app);
+				}
 			}
 		}