Cr2Decompressor::decodeN_X_Y(): make sure that slices cover the whole image size.
Cr2Decompressor::decodeN_X_Y(): make sure that slices cover the whole image size.

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