testdisplay: set a non-zero exit code if getopt detected an error

Signed-off-by: Thomas Wood <thomas.wood@intel.com>

diff --git a/tests/testdisplay.c b/tests/testdisplay.c
index 3bf6133..a187c16 100644 (file)
--- a/tests/testdisplay.c
+++ b/tests/testdisplay.c
@@ -672,7 +672,7 @@ static void __attribute__((noreturn)) usage(char *name)
        igt_info("\t\t<vdisp>,<vsync-start>,<vsync-end>,<vtotal>\n");
        igt_info("\t\ttest force mode\n");
        igt_info("\tDefault is to test all modes.\n");
-       exit(0);
+       exit((optopt) ? -1 : 0);
 }
 
 #define dump_resource(res) if (res) dump_##res()