WIFI: Iperf example's parameter opt was uninitialized, may leads setsockoption invalide if it equal to 0

examples/wifi/iperf/components/iperf/iperf.c

@@ -124,7 +124,7 @@ static esp_err_t IRAM_ATTR iperf_run_tcp_server(void)
     int listen_socket;
     struct timeval t;
     int sockfd;
-    int opt;
+    int opt = 1;
 
     listen_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
     if (listen_socket < 0) {
@@ -195,7 +195,7 @@ static esp_err_t IRAM_ATTR iperf_run_udp_server(void)
     int want_recv = 0;
     uint8_t *buffer;
     int sockfd;
-    int opt;
+    int opt = 1;
     bool udp_recv_start = true ;
 
     sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
@@ -253,7 +253,7 @@ static esp_err_t iperf_run_udp_client(void)
     int want_send = 0;
     uint8_t *buffer;
     int sockfd;
-    int opt;
+    int opt = 1;
     int err;
     int id;