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_ring_sync_loop.c

@@ -97,7 +97,7 @@ int main(int argc, char **argv)
 
 	if (argc != 1) {
 		fprintf(stderr, "usage: %s\n", argv[0]);
-		exit(-1);
+		igt_fail(-1);
 	}
 
 	fd = drm_open_any();
@@ -111,20 +111,20 @@ int main(int argc, char **argv)
 	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
 	if (!bufmgr) {
 		fprintf(stderr, "failed to init libdrm\n");
-		exit(-1);
+		igt_fail(-1);
 	}
 	drm_intel_bufmgr_gem_enable_reuse(bufmgr);
 
 	batch = intel_batchbuffer_alloc(bufmgr, devid);
 	if (!batch) {
 		fprintf(stderr, "failed to create batch buffer\n");
-		exit(-1);
+		igt_fail(-1);
 	}
 
 	target_buffer = drm_intel_bo_alloc(bufmgr, "target bo", 4096, 4096);
 	if (!target_buffer) {
 		fprintf(stderr, "failed to alloc target buffer\n");
-		exit(-1);
+		igt_fail(-1);
 	}
 
 	store_dword_loop(fd);