ddee921170
on the 802.11n NICs. The 802.11n NICs return a TBTT value that continues far past the 16 bit HAL_BEACON_PERIOD time (in TU.) The code would constrain nextslot to HAL_BEACON_PERIOD, but it wasn't constraining nexttbtt - the pre-11n NICs would only return TU values from 0 -> HAL_BEACON_PERIOD. Thus, when nexttbtt exceeded 64 milliseconds, it would not wrap (but nextslot did) which lead to a huge tsfdelta. So until the slot calculation is converted to work in TSF rather than a mix of TSF and TU, "make" the nexttbtt values match the TU assumptions for pre-11n NICs. This fixes the crazy deltatsf calculations but it doesn't fix the non-convergent tsfdelta issue. That'll be fixed in a subsequent commit.
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