tests: use igt_fail instead of exit(param != 0)

Mostly a sed job with too manual fixups:
- one case of using _exit instead of exit
- and one case which under some conditions use 77, so convert that
  check to an igt_skip.

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

tests/gem_cs_tlb.c

@@ -125,7 +125,7 @@ static void run_on_ring(int fd, unsigned ring_id, const char *ring_name)
 		}
 
 		if (exec(fd, handle_new, split, &gtt_offset_new, 0))
-			exit(1);
+			igt_fail(1);
 
 		if (split > 0) {
 			/* Check that we've managed to collide in the tlb. */