If including the 1098 associated with your mortgage did not change your return at all or affect your bottom line, then you do not need to file the amended return. Filing the amended return would only be needed if you were receiving some of your original balance due back in the form of a refund, or if you owed additional tax.
It may not have changed anything if your original return used the standard deduction and the additional mortgage interest did not cause the itemized deductions to be the better choice for your tax situation.
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