Silence complaint about dead assignment

The preferred place for "placate compiler" assignments is after
elog(ERROR), not before it.  Otherwise, scan-build complains about a
dead assignment.

src/backend/commands/tablecmds.c

@@ -13251,8 +13251,8 @@ RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid, Oid oldrelid,
 		reltype = ((AlterTableStmt *) stmt)->relkind;
 	else
 	{
-		reltype = OBJECT_TABLE; /* placate compiler */
 		elog(ERROR, "unrecognized node type: %d", (int) nodeTag(stmt));
+		reltype = OBJECT_TABLE; /* placate compiler */
 	}
 
 	/*