Btrfs: if we aren't committing just end the transaction if we error out

I hit a deadlock where transaction commit was waiting on num_writers to be
0.  This happened because somebody came into btrfs_commit_transaction and
noticed we had aborted and it went to cleanup_transaction.  This shouldn't
happen because cleanup_transaction is really to fixup a bad commit, it
doesn't do the normal trans handle cleanup things.  So if we have an error
just do the normal btrfs_end_transaction dance and return.  Once we are in
the actual commit path we can use cleanup_transaction and be good to go.
Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

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