[microblaze-uclinux] copy_to_user problem

["Bartsch Carsten" <cbartsch@xxxxxxxxxx>]

Here is a small fix for the macros copy_to_user and copy_from_user. It
took me quite some time to figure out why the ipc messages didn't work
as intended. I saw other code that could trigger this bug, so this might
help.

Carsten


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