awgtpman: new mbuf code just gives 'divide by zero' when running against old mbufs

Should detect the problem and issue a relevant message.

assigned to @erik.vonreis

changed milestone to %4.2.6

unassigned @erik.vonreis

assigned to @erik.vonreis

mentioned in merge request !273 (merged)

mentioned in commit 7874d6e5

closed with merge request !273 (merged)