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MFC r333131:

Fix iflib_encap() EFBIG handling bugs

1) Don't give up if m_collapse() fails.  Rather than giving up, try
m_defrag() immediately.

2) Fix a leak where, if the NIC driver rejected the defrag'ed chain
as having too many segments, we would fail to free the chain.

Reviewed by:  Matthew Macy <mmacy at mattmacy.io> (this version of patch)
Submitted by: Matthew Macy <mmacy at mattmacy.io> (early version of leak fix)

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