btrfs: simplify error handling in __btrfs_write_out_cache()

The error cleanup gotos in __btrfs_write_out_cache() needlessly jump
back making the code less readable then needed.  Flatten them out so no
back-jump is necessary and the read flow is uninterrupted.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>