selftests: net: tls: remove unused variable and code

When building selftests/net with clang, the compiler warn about the
function abs() see below:

tls.c:657:15: warning: variable 'len_compared' set but not used [-Wunused-but-set-variable]
        unsigned int len_compared = 0;
                     ^

Rework to remove the unused variable and the for-loop where the variable
'len_compared' was assinged.

Fixes: 7f657d5bf5 ("selftests: tls: add selftests for TLS sockets")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/tls.c

@@ -654,7 +654,6 @@ TEST_F(tls, recvmsg_single_max)
 TEST_F(tls, recvmsg_multiple)
 {
 	unsigned int msg_iovlen = 1024;
-	unsigned int len_compared = 0;
 	struct iovec vec[1024];
 	char *iov_base[1024];
 	unsigned int iov_len = 16;
@@ -675,8 +674,6 @@ TEST_F(tls, recvmsg_multiple)
 	hdr.msg_iovlen = msg_iovlen;
 	hdr.msg_iov = vec;
 	EXPECT_NE(recvmsg(self->cfd, &hdr, 0), -1);
-	for (i = 0; i < msg_iovlen; i++)
-		len_compared += iov_len;
 
 	for (i = 0; i < msg_iovlen; i++)
 		free(iov_base[i]);