tkt_MakeTicket5: Use correct bitmask operator

tkt_MakeTicket5 tries to avoid returning heimdal asn1 error codes,
but uses an incorrect expression that's almost always true. Use
bitwise & instead of logical && to fix.

Change-Id: I59bffe8c9b98c6f32b967bc37a7989c98c5720b6
Reviewed-on: http://gerrit.openafs.org/10264
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Simon Wilkinson <simonxwilkinson@gmail.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>