Correct the definition of PFIL_HOOKED() so that it compares the value of ph_nhooks to zero, not the address.  This removes extranious calls to pfil_run_hooks (and an rw lock) from the network stack's critical path when no pfil hooks are active.
Correct the definition of PFIL_HOOKED() so that it compares
the value of ph_nhooks to zero, not the address.  This removes
extranious calls to pfil_run_hooks (and an rw lock) from the
network stack's critical path when no pfil hooks are active.

Reviewed by: csjp
Sponsored by: Myricom Inc.

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