Fix crash on sector buffer invalidation after writing to device #148
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This pull request fixes a bug that was introduced when FAT16 support was introduced in the
CORRECT_BUFroutine. When a buffer had to be invalidated after a write, the pointer to the buffer in the buffer chain had been corrupted, and the process eventually caused a crash.This is difficult to test but some people has reported it being reproduced while using the AKID text editor. See also #142.
Closes #142