gunzip: fix incorrect decoding of "fixed" inflate blocks

function                                             old     new   delta
huft_build                                          1008    1022     +14
inflate_block                                       1253    1256      +3
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 17/0)               Total: 17 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed