cscd: return meaningful error codes.
msrle: return meaningful error codes.
tmv: return meaningful error codes.
pcx: return meaningful error codes.
nuv: return meaningful error codes.
qpeg: return a meaningful error code.
targa: return meaningful error codes.
lcldec: return meaningful error codes.
interplayvideo: return meaningful error codes.
interplayvideo: remove a static variable.
gifdec: return meaningful error codes.
qtrle: return a meaningful error code.
qdrw: return meaningful error codes.
qdrw: cosmetics, reformat
rpza: return a meaningful error code.
vcr1: return a meaningful error code.
vcr1: remove disabled encoder stub
flicvideo: return meaningful error codes.
loco: return meaningful error codes.
loco: cosmetics, reformat