vfio: fix a warning message
The first argument to the WARN() macro has to be a condition. I'm sort of disappointed that this code doesn't generate a compiler warning. I guess -Wformat-extra-args doesn't work in the kernel. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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