Fixed bug I introduced when changing PCB list to use 4.4BSD style queue macros. Basically, detect 'tp' going away differently.
Fixed bug I introduced when changing PCB list to use 4.4BSD style queue
macros. Basically, detect 'tp' going away differently.

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