Various minor whitespace cleanups

Accumulated along the way.

Remove no longer needed casts for radix routines

net/radix: Update rn_inithead() parameter type to avoid boring casts

Change to use the proper 'struct radix_node_head **' instead of an
opaque 'void **'.

kernel: Use rn_flush()/rn_freehead() to flush/delete radix trees

ipfw3 table: remove the `static`

ipfw3_table: invoke the init in ipfw3_basic module

ipfw3 table 1 type ip
ipfw3 table 1 append ip <ip>
ipfw3 table list
ipfw3 table 1 show

Update rn_inithead() users to switch to byte offset

ipfw3: Fix offset mistake in creating the MAC-type table

The rn_inithead() requires the offset be the bit count of the address
portion from the key beginning, so it should be
offsetof(struct sockadd

ipfw3: Fix offset mistake in creating the MAC-type table

The rn_inithead() requires the offset be the bit count of the address
portion from the key beginning, so it should be
offsetof(struct sockaddr, sa_data) * NBBY = 2 * 8 = 16 (instead of 48)
for the MAC-type table.

Also change to use offsetof() to replace the hardcode 32 in creating the
IP-type table. In addition, improve the assignments of sin_len/sa_len
members of the keys.

While there, fix the indentation style.

show more ...

kernel: No need to handle mbuf allocation failures if use M_WAITOK

network - Remove host-order translations of ipv4 ip_off and ip_len

* Do not translate ip_off and ip_len to host order and then back again
in the network stack. The fields are now left in network

network - Remove host-order translations of ipv4 ip_off and ip_len

* Do not translate ip_off and ip_len to host order and then back again
in the network stack. The fields are now left in network order.

show more ...

kernel: Rename BUILDING_WITH_KERNEL to KERNBUILDDIR.

Fits better with e.g. KERNCONFDIR.

Add a small paragraph in kmod.mk which was taken from FreeBSD.