devices/adms/admst/ngspiceMODULEdel.c.xml, bug fix, endless loop

A missing update of "prev" would cause endless looping
  when searching for a device instance.

introduced in commit:
> commit 38e68869a2
> Date:   Wed Mar 1 14:30:24 2006 +0000
>
>     Added mdel, del and dest functions to interface.

src/spicelib/devices/adms/admst/ngspiceMODULEdel.c.xml

@@ -63,6 +63,7 @@ int $(module)delete(GENmodel *inModel, IFuid name, GENinstance **inInst)
 	      FREE(here);
 	      return(OK);
 	      }
+	  prev = &(here->$(module)nextInstance);
          
     } 
   }