Minor changes to memset() call

Call calloc() instead of malloc()/memset().

src/ipv4.c

@@ -116,19 +116,14 @@ static inline void route_destroy(struct rtentry *route)
 static int ipv4_get_route(struct rtentry *route)
 {
 	size_t buffer_size = IPV4_GET_ROUTE_BUFFER_CHUNK_SIZE;
-	char *buffer = malloc(buffer_size);
+	char *buffer;
 	char *realloc_buffer;
 	int err = 0;
 	char *start, *line;
 	char *saveptr1 = NULL, *saveptr2 = NULL;
 	uint32_t rtdest, rtmask, rtgtw;
 	int rtfound = 0;
 
-	if (!buffer) {
-		err = ERR_IPV4_SEE_ERRNO;
-		goto end;
-	}
-
 	/*
 	 * initialize the buffer with zeroes, aiming to address the
 	 * coverity issue "TAINTED_SCALAR passed to a tainted sink"
@@ -148,7 +143,12 @@ static int ipv4_get_route(struct rtentry *route)
 	 *   that there is a delimiting '\0' character by proper
 	 *   initialization. We ensure this also when growing the buffer.
 	 */
-	memset(buffer, '\0', IPV4_GET_ROUTE_BUFFER_CHUNK_SIZE);
+	buffer = calloc(1, buffer_size);
+	if (!buffer) {
+		err = ERR_IPV4_SEE_ERRNO;
+		goto end;
+	}
+
 	log_debug("ip route show %s\n", ipv4_show_route(route));
 
 	// store what we are looking for

src/tunnel.c

@@ -808,7 +808,7 @@ static int tcp_connect(struct tunnel *tunnel)
 	log_debug("server_addr: %s\n", inet_ntoa(server.sin_addr));
 	log_debug("server_port: %u\n", ntohs(server.sin_port));
 	server.sin_family = AF_INET;
-	memset(&(server.sin_zero), '\0', 8);
+	memset(&(server.sin_zero), 0, sizeof(server.sin_zero));
 	log_debug("gateway_ip: %s\n", inet_ntoa(tunnel->config->gateway_ip));
 	log_debug("gateway_port: %u\n", tunnel->config->gateway_port);
 
@@ -840,7 +840,7 @@ static int tcp_connect(struct tunnel *tunnel)
 		// be careful not to fetch too many bytes at once
 		const char *response = NULL;
 
-		memset(&(request), '\0', sizeof(request));
+		memset(&(request), 0, sizeof(request));
 		for (int j = 0; response == NULL; j++) {
 			if (j >= ARRAY_SIZE(request) - 1) {
 				log_error("Proxy response is unexpectedly large and cannot fit in the %lu-bytes buffer.\n",