Improve pglz_decompress() so that it cannot clobber memory beyond the

available output buffer when presented with corrupt input.  Some testing
suggests that this slows the decompression loop about 1%, which seems an
acceptable price to pay for more robustness.  (Curiously, the penalty
seems to be *less* on not-very-compressible data, which I didn't expect
since the overhead per output byte ought to be more in the literal-bytes
path.)

Patch from Zdenek Kotala.  I fixed a corner case and did some renaming
of variables to make the routine more readable.

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