Cr2Decompressor::decodeN_X_Y(): try to not overflow the image line.
Cr2Decompressor::decodeN_X_Y(): try to not overflow the image line.

This algo is just absolutely horrible garbage.
There can't not be a better way to [re]write it.

LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed