libafs: fix error location code in LINUX/osi_export

Fix the missing error location code introduced in commit
40fb2650b783fbafe51aefd3d0af7a6b0536c265
libafs: allocate vattrs in LINUX to reduce stack used

Use location number 104, which is the next in the sequence.

The code in this module is compiled when building the
nfs translator, which is only built under linux when
configure detects it is possible.

Thanks to Andrew Deason for spotting this error.

Reviewed-on: http://gerrit.openafs.org/11351
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: D Brashear <shadow@your-file-system.com>
(cherry picked from commit 05dbea9fc4da02c6349d9e0b69656acb3254cfe8)

Change-Id: I5bb69b68716f6a7147d24c0bd698c10488bca2d4
Reviewed-on: http://gerrit.openafs.org/11366
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>