pfsync_state_import() must not be called with the pf state lock held,

pfsync_state_import() must not be called with the pf state lock held,
since the actual modification of the state table is done by a call to
pf_state_insert(), which takes the pf state lock itself.  Other calls
to pfsync_state_import() also only have the pf lock.

Reported-by: syzbot+d6ea8620b43dc69ecbc6@syzkaller.appspotmail.com
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