Remove extra memory region kept by "struct pfil_head pfil_head_t;".
Remove extra memory region kept by "struct pfil_head pfil_head_t;".

Seems to be a typo for typedef, but we don't want this non-style(9)
typedef anyway.

PR:		kern/31356

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase