[issue1859] panic: assertion in mark_ecn (pf related)

[Matthew Dillon]

    Never mind, I found it.  I mis-coded altq_red... I thought it could
    only be called from PF but in fact it can be called directly via 
    ifq_enqueue().

    I have pushed a fix, please test.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>