MFC r311290,r311293,r311294:

MFC r311290,r311293,r311294:

r311290:

Use strlcpy instead of strcpy when copying the bridge name to ifr.ifr_name
to avoid buffer overflows

CID:		1006735, 1006737, 1006738

r311293:

bridge_do_pfctl: allocate mib_name dynamically using asprintf

This is being done to reduce wasted space, simplify complexity in
the code, and to quell a Coverity warning about buffer overruns.
warning about buffer overruns.

CID:		1006736

r311294:

style cleanup

- bridge_pf_dump: use nitems instead of spelling it out longhand
- bridge_do_pfctl: sort variables by alignment for type