Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

sys/net* : for pointers replace 0 with NULL.

Mostly cosmetical, no functional change.

Found with devel/coccinelle.

Mechanically substitute flags from historic mbuf allocator with
malloc(9) flags within sys.

Exceptions:

- sys/contrib not touched
- sys/mbuf.h edited manually

Mechanically remove the last stray remains of spl* calls from net*/*.
They have been Noop's for a long time now.

Node constructor methods are supposed to be called in syscall
context always. Convert nodes to consistently use M_WAITOK flag
for memory allocation.

Reviewed by: julian

Don't use data after free.

Found by: Coverity Prevent
CID: 536
Submitted by: harti (via vs)

/* -> /*- for license, minor formatting changes

This is the netgraph node framework for the user side call control
node for ATM. This node implements the API to the signalling services.