virsh: edit: don't leak XML string on reedit or redefine
Free the old XML strings before overwriting them if the user has chosen to reedit the file or force the redefinition. Found by Alex Jia trying to reproduce another bug: https://bugzilla.redhat.com/show_bug.cgi?id=977430#c3 (cherry picked from commit 1e3a2529)
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