ath/regd.c: regdomain 0x8000 fails to retrieve a regulatory domain pair

[Joerg Albert <jal2@xxxxxx>]

Plugging in a WNDA3100 (ar9170usb) I get the error

ath: No regulatory domain pair found, cannot continue

Seems like the EEPROM of the stick initializes regulatory.current_rd 
to 0x8000, current_rd_ext to 0. Is this a valid setting?

Looked into ath/regd.c, ath_regd_init():

ath_get_regpair(regdmn)

is called with regdmn == 0x8000 and returns NULL.

Shall that regdmn value be dealt with by

        if (reg->country_code == CTRY_DEFAULT &&
            regdmn == CTRY_DEFAULT)
                reg->country_code = CTRY_UNITED_STATES;
?

wireless-testing is git v2.6.30-rc4-22735-gbd48c47, I run 
compat-wireless with a 2.6.29.2 kernel.
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