Fix breakage from GUC-extension-variables patch.

Author: tglsfdc

src/backend/utils/misc/help_config.c

@@ -10,7 +10,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/misc/help_config.c,v 1.10 2004/05/26 15:07:39 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/help_config.c,v 1.11 2004/06/02 18:09:32 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -46,13 +46,16 @@ static bool displayStruct(mixedStruct *structToDisplay);
 int
 GucInfoMain(void)
 {
-	int			i;
-	struct config_generic **guc_vars = get_guc_variables();
-	int numOpts = GetNumConfigOptions();
+	struct config_generic **guc_vars;
+	int			numOpts,
+				i;
 
 	/* Initialize the guc_variables[] array */
 	build_guc_variables();
 
+	guc_vars = get_guc_variables();
+	numOpts = GetNumConfigOptions();
+
 	for (i = 0; i < numOpts; i++)
 	{
 		mixedStruct *var = (mixedStruct *) guc_vars[i];