revert unneeded change and add comment to avoid it in the future

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6140 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_rpt.c

@@ -379,7 +379,8 @@ static int myatoi(char *str)
 int	ret;
 
 	if (str == NULL) return -1;
-	if (sscanf(str,"%d",&ret) != 1) return -1;
+	/* leave this %i alone, non-base-10 input is useful here */
+	if (sscanf(str,"%i",&ret) != 1) return -1;
 	return ret;
 }