Remove saved_queryId variable.

This variable is unused on pg13 and below, which leads to spurious warnings.

Since that variable is only used once and since the saved value is never
overwritten, simply use the target value.

pg_store_plans.c

@@ -1120,10 +1120,9 @@ pgsp_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 					DestReceiver *dest, COMPTAG_TYPE *completionTag)
 {
 	int			tag = nodeTag(pstmt->utilityStmt);
-	queryid_t	saved_queryId = pstmt->queryId;
 	bool		reset_force_disabled = false;
 
-	if (pgsp_enabled(saved_queryId) &&
+	if (pgsp_enabled(pstmt->queryId) &&
 		(tag == T_CreateExtensionStmt || tag == T_AlterExtensionStmt) &&
 		!force_disabled && track_level < TRACK_LEVEL_VERBOSE)
 	{