go/neo/neonet: Fix thinko in recvPkt
We were returning packet with tail read for next packet data. Previously decoding was forgiving, but upcoming rework for msgpack support will add check to catch packets with overlong payload, e.g. === RUN TestEmptyDB/py/!ssl I: runneo.py: /tmp/neo214694750/1 !ssl: started master(s): 127.0.0.1:30621 127.0.0.1:42266 > 127.0.0.1:30621: .1 RequestIdentification &{CLIENT ?(0)0 1 ø [] []} 127.0.0.1:42266 < 127.0.0.1:30621: (N: decode header: len(payload) != msgLen) 00 00 00 01 80 01 00 00 00 09 00 f0 00 00 01 e0 00 00 01 00 00 00 00 00 06 00 00 00 58 41 d7 ff 69 82 0a 91 25 00 00 00 03 02 00 00 00 00 e0 00 00 01 02 41 d7 ff 69 82 0a 78 ff 01 00 00 00 09 31 32 37 2e 30 2e 30 2e 31 96 f7 00 00 00 01 02 41 d7 ff 69 81 c6 65 f5 00 00 00 00 09 31 32 37 2e 30 2e 30 2e 31 77 9d f0 00 00 01 02 ff ff ff ff ff ff ff ff 00 00 00 02 00 0a 00 00 00 19 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 01 00 00 00 01 00 00 00 01 01 -> Fix is: pkt.data should be data[:pktLen], not data[:n] since n is how much we have read at all.
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