More fixes for problems found by -Wextra #2475
Merged
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More actual (unreported) buglets revealed by -Wextra pointing out function
parameters that were unused.
Failed to properly swap endianness when decoding Canon camera info.
ColorProcessor::apply methods were not using chanstride param.
texture3d fixes: some deriv results dropped on the floor
Get rid of unused parameters in some internal functions. Not a bug
per se, but could be misleading about how the functions operate.