cr-service: feature check core dumps if criu_req->criu_opts is empty

Trying to use the FEATURE_CHECK RPC with criu_req->criu_opts set to NULL
makes CRIU segfault. Technically there is no reason to have a valid
criu_req->criu_opt during feature check. The only reason was to set the
image directory for setproctitle(). This removes the segfault and the
unnecessary requirement of setting criu_req->criu_opts.

Another possible solution would have been to return an error if
criu_req->criu_opts is NULL but so far it seems unnecessary to have
criu_req->criu_opts during feature check.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/cr-service.c

@@ -852,16 +852,13 @@ static int handle_feature_check(int sk, CriuReq * msg)
 	if (pid == 0) {
 		int ret = 1;
 
-		if (setup_opts_from_req(sk, msg->opts))
-			goto cout;
-
-		setproctitle("feature-check --rpc -D %s", images_dir);
+		setproctitle("feature-check --rpc");
 
 		kerndat_get_dirty_track();
 
 		if (kdat.has_dirty_track)
 			ret = 0;
-cout:
+
 		exit(ret);
 	}