Error message references wrong argument (Issue 7951)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@42946 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_zap.c

@@ -9329,7 +9329,7 @@ static int handle_pri_show_span(int fd, int argc, char *argv[])
 		return RESULT_SHOWUSAGE;
 	span = atoi(argv[3]);
 	if ((span < 1) || (span > NUM_SPANS)) {
-		ast_cli(fd, "Invalid span %s.  Should be a number %d to %d\n", argv[4], 1, NUM_SPANS);
+		ast_cli(fd, "Invalid span '%s'.  Should be a number from %d to %d\n", argv[3], 1, NUM_SPANS);
 		return RESULT_SUCCESS;
 	}
 	if (!pris[span-1].pri) {