De-duplicate a couple afs_CheckCode uniquifiers

These uniquifiers are supposed to be globally unique, to identify the
call site within the tree.  For whatever reason, a couple of them
were duplicated at different call sites; provide new (unique) values
to disambiguate between them.

There remain a couple of uniquifiers which are used in multiple
places, but those are in different architectures' implementations
of afs/ARCH/foo.c, and thus will be globally unique for any particular
build.

Change-Id: Iff5defcade74143a45d7ef3aaacbdeb7523f2a40
Reviewed-on: http://gerrit.openafs.org/10709
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>