SOLARIS: Correct ioctl syscall error handling

SOLARIS: Correct ioctl syscall error handling

Do not use the return code from ioctl for errno. Ioctl itself will set
the errno and return value correctly, so don't mess with them.

Reviewed-on: http://gerrit.openafs.org/4345
Tested-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 99ed22fb02a3b44c03327a1fdd5ef56e211724b6)

Change-Id: Ie7ba95f14a2c34f11b358b482bd58bdacba6bed6
Reviewed-on: http://gerrit.openafs.org/4369
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>