efivarfs: efivarfs_file_read ensure we free data in error paths
Signed-off-by: Andy Whitcroft <apw@canonical.com> Acked-by: Matthew Garrett <mjg@redhat.com> Acked-by: Jeremy Kerr <jeremy.kerr@canonical.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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