Mtx lock null

[Geramy]

Fixed the crash issue with the if_athp when it tried to go for a second load of the firmware and get the hardware caps. For some reason, as we know the first attempt to load the firmware and power up the device doesn't work so we go for 6 times. the second time will work but for some reason, the old fwlog from wmi is still running or maybe its ending and clearing out the log, but fwlog is still registered and running. So I added a mutex check so that the software doesn't crash and it successfully loads the firmware a second time.