Change #warnings to FIXMEs, so that we can build without NO_WERROR=1

src/net/tls.c

  * @v len		Length of buffer
  */
 static void tls_generate_random ( void *data, size_t len ) {
-#warning "Placeholder"
+	/* FIXME: Some real random data source would be nice... */
 	memset ( data, 0x01, len );
 }
 
 		return rc;
 	}
 
-#warning "AES needs to be fixed to not require this"
+	/* FIXME: AES needs to be fixed to not require this */
 	AES_convert_key ( rx_cipherspec->cipher_ctx );
 
 	DBGC ( tls, "TLS %p RX key:\n", tls );
 			       struct tls_cipherspec *pending,
 			       struct tls_cipherspec *active ) {
 
-#warning "Why is this disabled?"
+	/* FIXME: Why is this disabled? */
 #if 0
 	/* Sanity check */
 	if ( ( pending->pubkey == &crypto_null ) ||
  * @ret rc		Return status code
  */
 static int tls_send_client_key_exchange ( struct tls_session *tls ) {
-#warning "Hack alert"
+	/* FIXME: Hack alert */
 	RSA_CTX *rsa_ctx;
 	RSA_pub_key_new ( &rsa_ctx, tls->rsa_mod, tls->rsa_mod_len,
 			  tls->rsa_pub_exp, tls->rsa_pub_exp_len );
 	key_xchg.encrypted_pre_master_secret_len
 		= htons ( sizeof ( key_xchg.encrypted_pre_master_secret ) );
 
-#warning "Hack alert"
+	/* FIXME: Hack alert */
 	DBGC ( tls, "RSA encrypting plaintext, modulus, exponent:\n" );
 	DBGC_HD ( tls, &tls->pre_master_secret,
 		  sizeof ( tls->pre_master_secret ) );
 	uint8_t *cert = certificate->asn1_start;
 	int offset = 0;
 
+	/* FIXME */
+	(void) len;
+
 	if (asn1_next_obj(cert, &offset, ASN1_SEQUENCE) < 0 ||
 	    asn1_next_obj(cert, &offset, ASN1_SEQUENCE) < 0 ||
             asn1_skip_obj(cert, &offset, ASN1_EXPLICIT_TAG) ||
 static int tls_new_finished ( struct tls_session *tls,
 			      void *data, size_t len ) {
 
-#warning "Handle this properly"
+	/* FIXME: Handle this properly */
 	tls->tx_state = TLS_TX_DATA;
 	( void ) data;
 	( void ) len;
 	void *mac;
 	void *padding;
 
-#warning "TLSv1.1 has an explicit IV"
+	/* FIXME: TLSv1.1 has an explicit IV */
 	iv_len = 0;
 
 	/* Calculate block-ciphered struct length */
 	}
 	iv_len = tls->rx_cipherspec.cipher->blocksize;
 
-#warning "TLSv1.1 uses an explicit IV"
+	/* FIXME: TLSv1.1 uses an explicit IV */
 	iv_len = 0;
 
 	mac_len = tls->rx_cipherspec.digest->digestsize;