Remove warnings on Windows

tools/rand.c

@@ -110,7 +110,7 @@ bad:
 		}
 
 		if (hex) {
-			int i;
+			size_t i;
 			for (i = 0; i < len; i++) {
 				fprintf(outfp, "%02X", buf[i]);
 			}

tools/sdfdecrypt.c

@@ -61,7 +61,6 @@ int sdfdecrypt_main(int argc, char **argv)
 	SDF_CBC_CTX ctx;
 	const uint8_t *p;
 	SM2_CIPHERTEXT ciphertext;
-	uint8_t *wrappedkey;
 	size_t wrappedkey_len;
 
 	memset(&dev, 0, sizeof(dev));

tools/sdftest.c

@@ -2033,8 +2033,6 @@ static int speed_SDF_InternalEncrypt_ECC(int key)
 	unsigned char ucData[32] = {1}; // same as sm2_enctest.c
 	unsigned int uiDataLength = (unsigned int)sizeof(ucData);
 	ECCCipher eccCipher;
-	unsigned char ucDecData[256];
-	unsigned int uiDecDataLength;
 	clock_t begin, end;
 	double seconds;
 	int i, ret;

tools/tls13_client.c

@@ -597,7 +597,11 @@ bad:
 	}
 
 	if (!(hp = gethostbyname(host))) {
+#ifdef WIN32
+		fprintf(stderr, "%s: parse -host value error: %d\n", prog, WSAGetLastError());
+#else
 		fprintf(stderr, "%s: parse -host value error: %s\n", prog, hstrerror(h_errno));
+#endif
 		goto end;
 	}
 	server.sin_addr = *((struct in_addr *)hp->h_addr_list[0]);

tools/tls13_server.c

@@ -456,9 +456,6 @@ bad:
 	puts("start listen ...\n");
 	tls_socket_listen(sock, 1);
 
-
-restart:
-
 	//client_addrlen = sizeof(client_addr);
 	if (tls_socket_accept(sock, &client_addr, &conn_sock) != 1) {
 		fprintf(stderr, "%s: socket accept error\n", prog);