cxgbe/tom: don't leak resources tied to an active open request that
cannot be sent to the chip because a prerequisite L2 resolution
failed.

Submitted by:	Hariprasad at chelsio dot com (original version)
MFC after:	2 weeks.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272719 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f