BCD Decoding

[Evan Huus <eapache () gmail com>]

Alexis's ASAN build recently caught an error in
tvb_bcd_dig_to_wmem_packet_str in which it appears that if the least
significant nibble of the decoded byte is 0xf then we read one element
past the end of the 14-element digit array.

If the most significant nibble is 0xf we treat that as a stop
condition. Is the correct approach to treat a least significant nibble
of 0xf as a stop condition also?

While in the neighbourhood - shouldn't we be decoding the more
significant nibble first, not second? Wiki states that most BCD
implementations are big-endian...

Cheers,
Evan
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