Make mira cope with out-of-range single frame error rate (SFER) values.

These are either due to driver bugs or rounding errors in fixed point math
but can be dealt with gracefully and don't occur often (only one instance
of this problem has been reported in the wild so far).

Turn related panics into debug printfs.
With 'ifconfig athn0 debug' the kernel now prints notifications about
out-of-range SFER values in dmesg. Compile a kernel with 'option MIRA_DEBUG'
to get a dump of driver stats in dmesg as well.

This change should prevent an undesirable panic reported by Peter Kay,
though it does not actually address the root cause of the problem.

ok tb@

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