Initialise sflags for stnZ from delta star

Avoids use of an uninitialised value.

src/network.c

@@ -451,6 +451,7 @@ remove_subnets(void)
 		    nameZ->stn = stnZ;
 		    nameZ->up = NULL;
 		    nameZ->min_export = nameZ->max_export = 0;
+		    nameZ->sflags = 0;
 		    unfix(stnZ);
 		    add_stn_to_list(&stnlist, stnZ);
 		    legAZ->l.to = stnZ;