[PATCH] Abort early for bad option given to --cmdhelp

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/parse.c b/parse.c
index 2105e2b..03856dc 100644
--- a/parse.c
+++ b/parse.c
@@ -437,6 +437,9 @@
 				continue;
 		}
 
+		if (!match)
+			continue;
+
 		printf("%16s: %s\n", "type", typehelp[o->type]);
 		printf("%16s: %s\n", "default", o->def ? o->def : "no default");
 		show_option_range(o);