after log error, reset errno

plugin/business/traffic-mirror/src/ethdev.cpp

@@ -214,6 +214,8 @@ struct traffic_mirror_ethdev * traffic_mirror_ethdev_pcap_create(const char * st
     if(fd < 0)
     {
         TFE_LOG_ERROR(logger, "failed at create socket: %s", strerror(errno));
+        /* after log, reset errno */
+		errno = 0;
         goto errout;
     }
 
@@ -223,6 +225,8 @@ struct traffic_mirror_ethdev * traffic_mirror_ethdev_pcap_create(const char * st
     if(ioctl(fd, SIOCGIFHWADDR, &if_req) < 0)
     {
         TFE_LOG_ERROR(logger, "failed at read hwaddr of device %s: %s", str_ethdev, strerror(errno));
+        /* after log, reset errno */
+		errno = 0;
         goto errout;
     }
 
@@ -238,6 +242,8 @@ struct traffic_mirror_ethdev * traffic_mirror_ethdev_pcap_create(const char * st
     if (ioctl(fd, SIOCGIFMTU, &if_req) < 0)
     {
         TFE_LOG_ERROR(logger, "failed at read mtu of device %s: %s", str_ethdev, strerror(errno));
+        /* after log, reset errno */
+		errno = 0;
         goto errout;
     }