Fix the type of the idtype argument to wait6() in syscalls.master.
Fix the type of the idtype argument to wait6() in syscalls.master.

(Accidentally missed this in the previous commit)

Approved by:	re (kib)
MFC after:	1 week

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