Possible bug in ATX image handling code

[ksuszka]

I was skimming through code and caught something which may be a bug.
In line

SIO2Arduino/disk_image.cpp

Line 317 in 45fd906

fileIndex = file->read() + file->read() * 256 + file->read() * 512 + file->read() * 768;

(and in 3 additional places down the file) there is a 32 bit number decoded from four bytes, I think it sould be change into something like:

fileIndex = file->read() + file->read() * 256 + file->read() * 256*256 + file->read() * 256*256*256;

or

fileIndex = file->read() + file->read() * (1 << 8) + file->read() * (1 << 16) + file->read() * (1 << 24);