autofs4: cleanup active and expire lookup

autofs4: cleanup active and expire lookup

The lookup functions for active and expiring dentrys use parameters that
can be easily obtained on entry so we change the call to to take just the
dentry.  This makes the subsequent change, to send all lookups to
->lookup(), a bit cleaner.

Signed-off-by: Ian Kent <[email protected]>
Cc: Sage Weil <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Yehuda Saheh <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>