Fix crash when running unknown command via symlink.
(The error message was trying to print an uninitialied field.  Oops.)
diff --git a/main.c b/main.c
index d9408f3..18daafb 100644
--- a/main.c
+++ b/main.c
@@ -92,6 +92,7 @@
 	if (toys.argv[1]) {
 		if (toys.argv[1][0]!='-') {
 			toy_exec(toys.argv+1);
+			toys.which = toy_list;
 			error_exit("Unknown command %s",toys.argv[1]);
 		}
 	}