Fix a small memory leak.

[David Hampton]

Log Message:
-----------
Fix a small memory leak. Also tweak printfs for a 64 bit system.

Tags:
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gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/business/business-gnome:
        dialog-customer.c
        dialog-employee.c
        dialog-invoice.c
        dialog-job.c
        dialog-order.c
        dialog-vendor.c