[osg-submissions] Fix crash in bmp writer

[Farshid Lashkari]

Hi Robert,

The bmp writer crashes in certain cases. It happens when the computed
size of the image data is greater than the actual image size. This
causes the memcpy call to go out of the array bounds. I modified the
code so that it copies the data during the iteration, instead of
memcpy'ing. This fixes the problems i was having.

If you are curious, the writer was crashing when trying to write an
RGB image that was 2050 x 1280. You might be able to reproduce it by
allocating an empty image of that size and writing it to a file.

Cheers,
Farshid
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