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fw_env: correct writes to devices with small erase blocks
Some NOR flash devices have a small erase block size. For example, the Micron N25Q512 can erase in 4K blocks. These devices expose a bug in fw_env.c where flash_write_buf() incorrectly calculates bytes written and attempts to write past the environment sectors. Luckily, a range check prevents any real damage, but this does cause fw_setenv to fail with an error. This change corrects the write length calculation. The bug was introduced with commit 5608692 from 2008 and only affects configurations where the erase block size is smaller than the total environment data size. Signed-off-by: Dustin Byford <email@example.com>
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