Correct errno value.

Returning -{ERRVAL} is a kernel return convention, but userspace errno
assignment and associated functions deal with the positive numbers.
Correct the errno assignment introduced in
commit: 78899de14b476a759f4839eae4879d47e36a624a.

AOSP Bug: 200617
Bug: 27111481
Change-Id: Id4ee6545bcc56273ef356ebdb5683c3e38c85430
1 file changed