Reject ioctl commands for FLSHGCHR and FLSHPCHR if the size is greater
than sc->areq. This is a bounds check to ensure we're not just cramming
arbitrarily sized nonsense into the driver and overflowing the heap.
PR: 209545
Submitted by: cturt@hardenedbsd.org
MFC after: 2 weeks
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head/sys/dev/an/if_an.c