K 10
svn:author
V 2
bz
K 8
svn:date
V 27
2019-10-24T08:15:40.279187Z
K 7
svn:log
V 364
frag6: small improvements

Rather than walking the mbuf chain manually use m_last() which doing
exactly that for us.
Defer initializing srcifp for longer as there are multiple exit paths
out of the function which do not need it set.  Initialize before taking
the lock though.
Rename the mtx lock to match the type better.

MFC after:	3 weeks
Sponsored by:	Netflix

END