fsx: fix backwards parameters in complaint about overly long copy

fsx: fix backwards parameters in complaint about overly long copy

If fsx encounters a situation where copy_file_range reports that it
copied more than it was asked to, we report this as a failure.
Unfortunately, the parameters to the print function are backwards,
leading to this bogus complaint about a short copy:

do_copy_range: asked 28672, copied 24576??

When we really asked to copy 24k but 28k was copied instead.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>