Check for error return from forkClient.  This fixes the crash reported in bug 982608.
Check for error return from forkClient.  This fixes the crash reported
in bug 982608.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb