Check return value from k5_mutex_lock() to partially mitigate some assertion failures when mutexes get destroyed out from under us. Commit By: tlyu Revision: 20529 Changed Files: _U trunk/ U trunk/src/lib/gssapi/mechglue/g_initialize.c U trunk/src/lib/krb5/ccache/cc_file.c U trunk/src/util/et/error_message.c