CA-140343: Fix error sign to display meaningful message.

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
It's probably not as simple as fixing the sign of the error. In line 127 above, err is set to EINVAL which is positive. If that code path is executed, with this patch we will be passing a negative value to strerror. I think the problem is with the consistency of the sign. You probably have to backtrack a little and see what can be the possible signs coming in and make sure it is consistent by the time it gets to this log message.