VC5Decompressor::Wavelet::combineLowHighPass(): add extra nesting
VC5Decompressor::Wavelet::combineLowHighPass(): add extra nesting

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