Replace ctl_min() macro with MIN().

MFC after:	1 week
Cleanup the code.

Reported by:	Coverity
CID:		1232003
Add to sbappendstream_locked() a check against NULL mbuf, like it is done
in sbappend_locked() and sbappendrecord_locked().

This is a quick fix to the panic introduced by r274712.

A proper solution should be to make sosend_generic() avoid calling
pru_send() with NULL mbuf for the protocols that do not understand
control messages. Those protocols that understand control messages,
should be able to receive NULL mbuf, if control is non-NULL.
Report XML parsing errors.

MFC after:	3 days
Report initiator id in portlist XML in more formalized way.

MFC after:	3 days
Increase allowed size of the microcode blob to 32KB.  Some Intel CPU's
updates weight 28KB.

PR:	179523
MFC after:	1 week