iommu: iommu-debug: Return an error value on invalid data format

If a user passes an invalid data format to the "unmap" debugfs file,
return a negative value instead of zero.

Change-Id: Ie9a0086901f1445935818583d78e06193f3133b1
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
1 file changed