[cvs-nhc98] Fix driver-script failure to return an error code.

malcolm: Thu Jan 11 23:59:05 CET 2001 Update of /usr/src/master/nhc/script In directory hinken:/tmp/cvs-serv24440 Modified Files: nhc98.inst Log Message: Fix driver-script failure to return an error code. This fault was introduced recently when allowing per-file OPTIONS to be read from the source file. The per-file section went into a sub-shell in the driver, but I didn't notice that error exit codes would no longer be propagated out. Easy to fix.