vlserver: make rxinfo threadsafe
The vlserver has a function 'rxinfo' used for printing out information
about an RX call for logging purposes, which used a static string.
Change it to use a caller-passed buffer, so it is safe to use in
multiple threads.
Change-Id: I186010792e743bc9676ddd5b4c99f011b64988e6
Reviewed-on: http://gerrit.openafs.org/1545
Tested-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Alistair Ferguson <alistair.ferguson@mac.com>
Reviewed-by: Dan Hyde <drh@umich.edu>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>