The 'hash' subword doesn't bring any additional information. All inpcb
lookup functions operate on hashes.
For lookup functions that work on either exact hash or wild hash just
perform s/hash_//. Rename in_pcblookup_hash() into in_pcblookup_locked(),
emphasizing its difference to in_pcblookup_smr() and fact that it returns
a locked inpcb. Rename in_pcblookup_hash_locked() to
in_pcblookup_internal(), as it doesn't return a locked inpcb and is used
only for internal purposes. Some future changes will make this name more
justified.
No functional change.