nand_geom and nand_cdev fixes

[Grzegorz Bernacki]

Hi,

I've made two fixes in nand_geom.c and nand_cdev.c. First one is related
to allocating internal buffer for reading/programming data. To avoid
allocation of memory which is too big, I allocate buffer which has size
of 16 pages and read/program data in ten-pages chunks.
Second change is to skip copyout() when nand_read_pages_raw() fails.
I've attached patch with these changes. Can I ask for test/review of
these changes?

thanks,
grzesiek
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