Do not check *aoutSize in PGetPAG

Do not check *aoutSize in PGetPAG

*aoutSize is always zero in pioctls, since afs_HandlePioctl handles
checking the output buffer size, and sets outSize to 0 before calling
the pioctl. So, PGetPAG was always returning E2BIG; remove the check to
make it work.

Reviewed-on: http://gerrit.openafs.org/814
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 97d3fcfcd1617bafa6ee62d291f09b2e8bb6daf7)

Change-Id: Icc401904c26027e235ec869e834297861a640d39
Reviewed-on: http://gerrit.openafs.org/816
Reviewed-by: Dan Hyde <drh@umich.edu>
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>