ERROR_NONE being counted as packet errors

[adampisula]

Hey there,

I've been playing with this library for a little bit and what concerned me when using it was that given this code from the test example:

Serial.printf("Universe %u / %u Channels | Packet#: %u / Errors: %u / CH1: %u\n",
                htons(packet.universe),                 // The Universe for this packet
                htons(packet.property_value_count) - 1, // Start code is ignored, we're interested in dimmer data
                e131.stats.num_packets,                 // Packet counter
                e131.stats.packet_errors,               // Packet error counter
                packet.property_values[1]);             // Dimmer data for Channel 1

the e131.stats.packet_errors kept incrementing with every packet I receive. I debugged it and it turned out that all of these errors were ERROR_NONE that were initially set here. Later there's an if statement checking if error is ERROR_IGNORE, but it doesn't exclude ERROR_NONEs.

I'll post a PR with a solution that I hope is acceptable.

[adampisula]

The PR is here.