Fix White level of Panasonic GH-2- thanks to Po-Jen Hsu for reporting and sample file.
Fix White level of Panasonic GH-2- thanks to Po-Jen Hsu for reporting and sample file.

anarsoul/rawspeed,anarsoul/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,mgehre/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,mgehre/rawspeed,anarsoul/rawspeed,klauspost/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,klauspost/rawspeed