Fix handling when MONITOR_EXEC is unspecified

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3141 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_monitor.c

@@ -233,8 +233,10 @@ int ast_monitor_stop( struct ast_channel *chan, int need_lock )
 			  soxmix = 1;
 			}			
 			snprintf(tmp, sizeof(tmp), "%s %s/%s-in.%s %s/%s-out.%s %s/%s.%s &", execute, dir, name, format, dir, name, format, dir, name, format);
-			if (soxmix) 
-			  snprintf(tmp2,sizeof(tmp2), "%s& rm -f %s/%s-* &",tmp, dir ,name); /* remove legs when done mixing */
+			if (soxmix) {
+			  snprintf(tmp2,sizeof(tmp2), "( %s && rm -f %s/%s-* ) &",tmp, dir ,name); /* remove legs when done mixing */
+			  strncpy(tmp, tmp2, sizeof(tmp) - 1);
+			}
 			ast_verbose("monitor executing %s\n",tmp);
 			if (ast_safe_system(tmp) == -1)
 			  ast_log(LOG_WARNING, "Execute of %s failed.\n",tmp);