Fix silly thinko in ALTER COLUMN TYPE. Check for finding expected

dependency was looking at wrong columns and so would always fail.
Was not exposed by regression tests because we are only testing cases
involving built-in (pinned) types and so no actual dependency entry
exists to be removed.

src/backend/commands/tablecmds.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.123 2004/08/01 20:30:48 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.124 2004/08/04 20:53:53 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -4888,8 +4888,8 @@ ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
 		if (foundDep->deptype != DEPENDENCY_NORMAL)
 			elog(ERROR, "found unexpected dependency type '%c'",
 				 foundDep->deptype);
-		if (foundDep->classid != RelOid_pg_type ||
+		if (foundDep->refclassid != RelOid_pg_type ||
-			foundDep->objid != attTup->atttypid)
+			foundDep->refobjid != attTup->atttypid)
 			elog(ERROR, "found unexpected dependency for column");
 
 		simple_heap_delete(depRel, &depTup->t_self);