avcodec/iff: Use unsigned to avoid compiler warning
GCC 12 apparently believes that negative palette sizes are
possible (they are not, as this has already been checked during
init) and therefore emits a -Wstringop-overflow= for the memcpy.
Using unsigned avoids this.
(To be honest, there might be a compiler bug involved.)
Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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