Even if biff is turned off, we still need to set curoff as the code uses that if there is an error writing to the mailbox.  Note this bug is only in the FreeBSD code, not the vendor code (which doesn't offer nobiff).
Even if biff is turned off, we still need to set curoff as the code
uses that if there is an error writing to the mailbox.  Note this bug
is only in the FreeBSD code, not the vendor code (which doesn't offer
nobiff).

PR:		misc/43392
MFC after:	3 days

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