Btrfs: move some common code into a subfunction
Some code to open block devices, to read the superblock and to handle errors was repeated multiple times in 3 places, and the following patch makes use of it as well. This code is now moved into a subfunction. Signed-off-by: NStefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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