Remove a small Ethernet debugging counter (earlephilhower#3217)

Author: earlephilhower

libraries/lwIP_Ethernet/src/LwipEthernet.cpp

@@ -206,7 +206,6 @@ int hostByName(const char* aHostname, IPAddress& aResult, int timeout_ms) {
     return 0;
 }
 
-uint32_t __ethernet_timeout_reached_calls = 0;
 static uint32_t _pollingPeriod = 20;
 
 // We have a background pump which calls sys_check_timeouts on a periodic basis
@@ -241,7 +240,6 @@ static void ethernetTask(void *param) {
 // This will only be called under the protection of the async context mutex, so no re-entrancy checks needed
 static void ethernet_timeout_reached(__unused async_context_t *context, __unused async_at_time_worker_t *worker) {
     assert(worker == &ethernet_timeout_worker);
-    __ethernet_timeout_reached_calls++;
     ethernet_arch_lwip_gpio_mask(); // Ensure non-polled devices won't interrupt us
     for (auto handlePacket : _handlePacketList) {
         handlePacket.second();