selftests: net: fix memory leak in tls.c

To free memory and close fd after use

Suggested-by: Jun Zhan <[e-mail]>
Signed-off-by: Cryolitia PukNgae <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/net/tls.c

···
 	EXPECT_GE(filefd, 0);
 	fstat(filefd, &st);
 	EXPECT_GE(sendfile(self->fd, filefd, 0, st.st_size), 0);
+
+	close(filefd);
 }
 
 TEST_F(tls, send_then_sendfile)
···
 
 	EXPECT_GE(sendfile(self->fd, filefd, 0, st.st_size), 0);
 	EXPECT_EQ(recv(self->cfd, buf, st.st_size, MSG_WAITALL), st.st_size);
+
+	free(buf);
+	close(filefd);
 }
 
 static void chunked_sendfile(struct __test_metadata *_metadata,