From c562354ab8bac92928eee086f64bd37c7c0e1647 Mon Sep 17 00:00:00 2001
From: bcran <bcran@FreeBSD.org>
Date: Thu, 20 Feb 2020 21:29:59 +0000
Subject: [PATCH] dtc: remove unknown option printf, since getopt will print it

Since we don't set opterr to 0, getopt prints a message when it
encounters an unknown/invalid option. We therefore don't need to
print our own message in the default handler.

Reviewed by:	kevans, theraven
Differential Revision:	https://reviews.freebsd.org/D23662
---
 usr.bin/dtc/dtc.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/usr.bin/dtc/dtc.cc b/usr.bin/dtc/dtc.cc
index 0cda698011ef..14d3685ba9d4 100644
--- a/usr.bin/dtc/dtc.cc
+++ b/usr.bin/dtc/dtc.cc
@@ -304,7 +304,10 @@ main(int argc, char **argv)
 			}
 			break;
 		default:
-			fprintf(stderr, "Unknown option %c\n", ch);
+			/* 
+			 * Since opterr is non-zero, getopt will have
+			 * already printed an error message.
+			 */
 			return EXIT_FAILURE;
 		}
 	}