The exif object sets the byte ordering on construction, and then
during later calls re-states the byte ordering when setting values.
It could be argued that this ordering should already be known to the exif
library and is redundant, but even so we must provide it.
Ensure we are consistent in always using the same byte ordering by setting
a private class member to re-use a single value.
Reviewed-by: Umang Jain <email@uajain.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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