support: Add options list terminator to the test driver

This avoids crashes if a test is passed unknown options.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

support/test-driver.c

@@ -155,6 +155,7 @@ main (int argc, char **argv)
     {
       CMDLINE_OPTIONS
       TEST_DEFAULT_OPTIONS
+      { 0, }
     };
   test_config.options = &options;
 #endif