MFC r247906:

The hashmask returned by hashinit() is a valid index in the returned hash array.
Fix a siftr(4) potential memory leak and INVARIANTS triggered kernel panic in
hashdestroy() by ensuring the last array index in the flow counter hash table is
flushed of entries.
MFC r247815:
Add quirk to enable headphones redirection on Lenovo X220.

PR:		kern/174876
Merge remote-tracking branch 'upstream/stable/9' into stable/9