o Test truncate(2) on fifo: it should ignore the request and return success.
o Test truncate(2) on fifo: it should ignore the request and
return success.

PR:		kern/98064
Submitted by:	Kirk Russell

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase