Change calls to error_msg.* and strerror to use perror_msg.*.
diff --git a/console-tools/dumpkmap.c b/console-tools/dumpkmap.c
index 3ff5ef6..c5a2ea7 100644
--- a/console-tools/dumpkmap.c
+++ b/console-tools/dumpkmap.c
@@ -50,7 +50,7 @@
 
 	fd = open("/dev/tty0", O_RDWR);
 	if (fd < 0) {
-		error_msg("Error opening /dev/tty0: %s\n", strerror(errno));
+		perror_msg("Error opening /dev/tty0");
 		return EXIT_FAILURE;
 	}