civetweb.c: fix sscanf format string to %u

[src/civetweb.c:5728]: (warning) %d in format string (no. 2) requires
 'int *' but the argument type is 'unsigned int *'.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

src/civetweb.c

@@ -5725,7 +5725,7 @@ static int parse_port_string(const struct vec *vec, struct socket *so)
         so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
         so->lsa.sin.sin_port = htons((uint16_t) port);
 #if defined(USE_IPV6)
-    } else if (sscanf(vec->ptr, "[%49[^]]]:%d%n", buf, &port, &len) == 2 &&
+    } else if (sscanf(vec->ptr, "[%49[^]]]:%u%n", buf, &port, &len) == 2 &&
                inet_pton(AF_INET6, buf, &so->lsa.sin6.sin6_addr)) {
         /* IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080 */
         so->lsa.sin6.sin6_family = AF_INET6;