btrfs: don't initialize 'offset' in map_private_extent_buffer()
In map_private_extent_buffer() the 'offset' variable is initialized to a page aligned version of the 'start' parameter. But later on it is overwritten with either the offset from the extent buffer's start or 0. So get rid of the initial initialization. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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