Andreas Kling bf1ad16078 LibC: Fix FILE::flush() passing bogus arguments to lseek() ...

This was a regression from the 64-bit off_t changes.

When dropping buffered data after a flush, we would subtract the
buffered amount from zero to get the seek offset. This didn't work
right since the subtraction was done with a 32-bit size_t and we
ended up with e.g (i64)0xfffffffc as the offset.

Fixes #6003.

2021-04-03 23:01:14 +02:00

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