rt2x00: add rt2x00_has_cap_* helpers
The rt2x00 code directly accesses the 'cap_flags' field of 'struct rt2x00_dev' when checking presence of a given capability flag. The direct access needs long expressions which lowers readability of the code. Add a few helper functions which can be used to test device capabilities without directly accessing the cap_flags filed. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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