dpx file length assertion

Hi,

Running this command:

> gm convert
~/pics/gm_dpx/flowers-1920x1080-LinearLuma-10.dpx
-resize 1919x1080 tmp.dpx

Prints this:

### File length 2768896, TellBlob says 2770332

Looks like some sort of assertion in the code. The
resulting image looks ok though.

This is with snapshot
GraphicsMagick-1.2.020060122.tar.gz, running on suse
9.3/x86, gcc 3.3.5.

By the way, thanks for the nice DPX support!



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