tests: fixup gem_exec_nop subtests

Note to self: No more pushing after 12 o'clock midnight. Not a good
idea, too embarassing.

tests/gem_exec_nop.c

@@ -73,7 +73,7 @@ static int exec(int fd, uint32_t handle, int loops, unsigned ring_id)
 	execbuf.num_cliprects = 0;
 	execbuf.DR1 = 0;
 	execbuf.DR4 = 0;
-	execbuf.flags = 0;
+	execbuf.flags = ring_id;
 	i915_execbuffer2_set_context_id(execbuf, 0);
 	execbuf.rsvd2 = 0;
 
@@ -111,6 +111,8 @@ int main(int argc, char **argv)
 	uint32_t devid;
 	int fd;
 
+	drmtest_subtest_init(argc, argv);
+
 	fd = drm_open_any();
 	devid = intel_get_drm_devid(fd);