Btrfs: don't panic if we're trying to drop too many refs

This is just obnoxious.  Just print a message, abort the transaction, and return
an error.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-04-24 16:38:50 -04:00
commit 32b0253803