Throw insufficient data error as an IO exception, that will allow more images to be partially decoded.
Throw insufficient data error as an IO exception, that will allow more images to be partially decoded.

git-svn-id: 04e88ac4940b0408b73cd6f458a224a262abaaff@225 ec705bc8-faf6-4f9b-9aff-b4916e9bedc3

jbuchbinder/rawspeed,jbuchbinder/rawspeed