Fix use of uninitialized variable.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/branches/gobject-engine-dev2@17431 57a11ea4-9604-0410-9ed3-97b8803252fd

src/engine/gnc-budget.c

@@ -240,9 +240,9 @@ gnc_budget_free(QofInstance *inst)
     GncBudget *budget;
 	BudgetPrivate* priv;
 
-    if (budget == NULL)
+    if (inst == NULL)
         return;
-    g_return_if_fail(GNC_IS_BUDGET(budget));
+    g_return_if_fail(GNC_IS_BUDGET(inst));
 
 	budget = GNC_BUDGET(inst);
 	priv = GET_PRIVATE(budget);