Optimise lzs_decompress() for literal bytes
Optimise lzs_decompress() for literal bytes

By adding the loop, we get about 7% performance improvement. For some
reason this *isn't* achieved by using __builtin_expect(). In fact, nowhere
that's seemed tempting to use __builtin_expect() so far has actually
turned out to give useful results.

This (and previous testing) is with
gcc version 4.9.2 20141101 (Red Hat 4.9.2-1) (GCC)

Signed-off-by: David Woodhouse <b460d66aaf00c296a3db1c1d9eeafc081d5f7d70@intel.com>

lins05/openconnect,cernekee/openconnect,brandt/openconnect,mveplus/openconnect-client,mveplus/openconnect-client,don-johnny/openconnect,liiir1985/openconnect,brandt/openconnect,don-johnny/openconnect,lins05/openconnect,matlockx/openconnect,nmav/openconnect-mine,atyndall/openconnect,liiir1985/openconnect,brandt/openconnect,mtmiller/openconnect,don-johnny/openconnect,lins05/openconnect,mtmiller/openconnect,nmav/openconnect-mine,lins05/openconnect,cernekee/openconnect,brandt/openconnect,atyndall/openconnect,mtmiller/openconnect,matlockx/openconnect,matlockx/openconnect,liiir1985/openconnect,cernekee/openconnect,liiir1985/openconnect,matlockx/openconnect,atyndall/openconnect,mveplus/openconnect-client,mtmiller/openconnect,don-johnny/openconnect,cernekee/openconnect,nmav/openconnect-mine,nmav/openconnect-mine,mveplus/openconnect-client,atyndall/openconnect