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In Musepack SV8 codec property tell the maximum nonzero band, but every
frame codes maximum band as a limit (i.e. strictly less than given value).
Synthesis also expects maximum nonzero band, so there's a need to convert
frame maximum band limit value.
(cherry picked from commit b56825c4

)

Conflicts:

	libavcodec/mpc8.c
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>