Data corruption on file copying/moving fixed

[Andrew V. Samoilov]

Hello!

There was a data corruption possibility in the file.c:copy_file_file()
for a years.  If mc_write() fails to write n_read bytes at once for some 
reason then n_read is fixed, but buf is not, so there are some pieces 
from beginning of buf instead of trailing part.

Possible scenario: copy/move file to some partition without enough 
space, remove some files to provide enough space and press "Retry".

Path commited.

-- 
Regards,
Andrew V. Samoilov
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