find: Exit if there is an unknown option.

Ignoring the parameter with the unknown options is unlikely to be what was
intended.

Example:
  find -n .

Note that things like
  find -n
already caused an exit, equivalent to "find" by itself.

1 files changed, 1 insertions, 1 deletions

diff --git a/usr.bin/find/main.c b/usr.bin/find/main.c
index 2c11936..d901623 100644
--- a/usr.bin/find/main.c
+++ b/usr.bin/find/main.c
@@ -120,7 +120,7 @@ main(int argc, char *argv[])
 			break;
 		case '?':
 		default:
-			break;
+			usage();
 		}
 
 	argc -= optind;