afs_vnop_attrs: syntax error in conditional expression

afs_vnop_attrs: syntax error in conditional expression

Add a missing && in a 2-line condition.
Not sure how this could have compiled successfully on the affected
platforms.

Change-Id: I2e8b791c6d8cd09795be1ef52c078ebfa5a3e53b
Reviewed-on: http://gerrit.openafs.org/1140
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit ddc64898e7b3a26e6514be63ef01672fe67cb851)
Reviewed-on: http://gerrit.openafs.org/1197