acr122_usb: check received Status Word (Touchatag)
Test if SW1 is 0x61 (means more bytes have to be read) before using SW2 as length. Update issue 251 The driver now check that Status Word (SW1) is equals to 0x61 (more data available) before using SW2 as length. If SW is not as expected, it show SW1 and SW2.
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