selftests: tls: skip cmsg_to_pipe tests with TLS=n

These are negative tests, testing TLS code rejects certain
operations. They won't pass without TLS enabled, pure TCP
accepts those operations.
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Fixes: d87d67fd ("selftests: tls: test splicing cmsgs")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/tls.c

@@ -683,6 +683,9 @@ TEST_F(tls, splice_cmsg_to_pipe)
 	char buf[10];
 	int p[2];
 
+	if (self->notls)
+		SKIP(return, "no TLS support");
+
 	ASSERT_GE(pipe(p), 0);
 	EXPECT_EQ(tls_send_cmsg(self->fd, 100, test_str, send_len, 0), 10);
 	EXPECT_EQ(splice(self->cfd, NULL, p[1], NULL, send_len, 0), -1);
@@ -703,6 +706,9 @@ TEST_F(tls, splice_dec_cmsg_to_pipe)
 	char buf[10];
 	int p[2];
 
+	if (self->notls)
+		SKIP(return, "no TLS support");
+
 	ASSERT_GE(pipe(p), 0);
 	EXPECT_EQ(tls_send_cmsg(self->fd, 100, test_str, send_len, 0), 10);
 	EXPECT_EQ(recv(self->cfd, buf, send_len, 0), -1);