In clnt_raw_create(), avoid minor race condition initializing the file-scope variable clntraw_private.
In clnt_raw_create(), avoid minor race condition initializing the
file-scope variable clntraw_private.

Found by:	Clang static analyzer
MFC after:	7 days

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