Skinny:

Do not try to create a wmem_strbuf whose size is bigger than the max size allowed -> using wmem_strbuf_new instead of wmem_strbuf_sized_new (Evan Huus)
While we are at it, fix errors spotted by the pre-commit tools/SkinnyProtocolOptimized -> Did not get any, can you specify which errors ? (Pascal Quantin)
FT_IPv6: 'ENC_BIG_ENDIAN | ENC_NA' -> 'ENC_NA' only (2) (Pascal Quantin)
Revert back to wmem_strbuf_sized_new instead of wmem_strbuf_new (Pascal Quantin)
Use wmem_strbuf_sized_new maxlength = 0  (Pascal Quantin)

Bug: 10409
Bug: 10410
Change-Id: Iebfcb53bc0a6289e02d10c38ecb717aa5c89389e
Reviewed-on: https://code.wireshark.org/review/3862
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>