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_largeobject.c

@@ -66,7 +66,7 @@ test_large_object(int fd)
 	if (ret) {
 		fprintf(stderr, "object creation failed: %s\n",
 			strerror(errno));
-		exit(ret);
+		igt_fail(ret);
 	}
 
 	pin.handle = create.handle;
@@ -74,7 +74,7 @@ test_large_object(int fd)
 	if (ret) {
 		fprintf(stderr, "pin failed: %s\n",
 			strerror(errno));
-		exit(ret);
+		igt_fail(ret);
 	}
 
 	gem_write(fd, create.handle, 0, data, obj_size);