Removed trailing \n from error_msg{,_and_die} messages.
diff --git a/mt.c b/mt.c
index 0d28339..683804b 100644
--- a/mt.c
+++ b/mt.c
@@ -76,7 +76,7 @@
 	}
 
 	if (code->name == 0) {
-		error_msg("unrecognized opcode %s.\n", argv[1]);
+		error_msg("unrecognized opcode %s.", argv[1]);
 		return EXIT_FAILURE;
 	}