Fix buffer overrun in pcfclock_read().  The submitter is the original author of the affected code.
Fix buffer overrun in pcfclock_read().  The submitter is the original
author of the affected code.

PR:		16552
Submitted by:	Sascha Schumann <sascha@schumann.cx>
Approved by:	jkh

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