Free the non-fatal "timestamp missing" debug string manually as it is not covered by the catch-all free for the error cases.
Free the non-fatal "timestamp missing" debug string manually as it is
not covered by the catch-all free for the error cases.

Found by:	Coverity

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