tests: roll out igt_simple_init/igt_simple_main

Also use igt_skip a bit more to simplify some of the tests.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/gem_tiling_max_stride.c

@@ -55,7 +55,7 @@ static void test_invalid_tiling(int fd, uint32_t handle, int stride)
  * Testcase: Check that max fence stride works
  */
 
-int main(int argc, char *argv[])
+igt_simple_main
 {
 	int fd;
 	uint32_t *ptr;
@@ -135,6 +135,4 @@ int main(int argc, char *argv[])
 	munmap(ptr, size);
 
 	close(fd);
-
-	return 0;
 }