Fix possible SLIOCSUNIT panic PR:		16564 Submitted by:	ru Approved by:	jkh
Fix possible SLIOCSUNIT panic
PR:		16564
Submitted by:	ru
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