btrfs: don't check for btrfs_device::bdev in btrfs_end_bio
btrfs_map_bio ensures that all submitted bios to devices have valid btrfs_device::bdev so this check can be removed from btrfs_end_bio. This check was added in june 2012 597a60fa ("Btrfs: don't count I/O statistic read errors for missing devices") but then in October of the same year another commit de1ee92a ("Btrfs: recheck bio against block device when we map the bio") started checking for the presence of btrfs_device::bdev before actually issuing the bio. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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