(plaintiff sued lawyer for malpractice with respect to clerical error in will; plaintiff was not a client of the lawyer; original will contained the clerical error that was corrected in later will that named plaintiff as prospective beneficiary in handwritten provision; second will was signed but not witnessed or notarized even though lawyer advised decedent that it needed to be in order to be valid; first will (which did not name plaintiff as beneficiary) admitted to probate; plaintiff claimed that lawyer owed plaintiff duty of care to ensure execution of later will; court rejected plaintiff's claim on basis that imposition of such duty would create conflict of interest by imposing simultaneous duty on lawyer owed to both decedent (client) and plaintiff (non-client)).