[rt2x00-users] possible minor issue in rt2800_config_lna_gain()

[Ronald Wahl]

Hi,

during debugging a scan issue I have seen that rt2800_config_lna_gain() 
is sometimes called with rf_channel 0 during scan. I'm not sure if this 
is going to cause some unwanted side effects. Maybe it is better to just 
return in this case instead of changing the lna_gain value.

- ron

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