storage: Cleanup virStorageFileBackendGlusterReadlinkCallback
Rather than having two exit paths, let's use a @retval value and VIR_STEAL_PTR in order to unite the exit path through the error label. Signed-off-by: NJohn Ferlan <jferlan@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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