Some cleanup and small changes:   - Use malloc() and free() instead of MALLOC() and FREE() macros.   - Do not check malloc results if M_WAITOK was used.   - Remove linked list of all netgraph sockets. It isn't needed.   - Use ng_findhook() instead of searching the list ourselves.   - Use NG_WAITOK in syscalls.   - Remove unneeded includes.   - style(9)
Some cleanup and small changes:
  - Use malloc() and free() instead of MALLOC() and FREE() macros.
  - Do not check malloc results if M_WAITOK was used.
  - Remove linked list of all netgraph sockets. It isn't needed.
  - Use ng_findhook() instead of searching the list ourselves.
  - Use NG_WAITOK in syscalls.
  - Remove unneeded includes.
  - style(9)

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