Don't assume that all notifications are NotifySlotChange #154
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CCID defines another type of message type on the interrupt pipe,
HardwareError, and others may also be conceivably sent. So check the
message type instead of assuming it's a NotifySlotChange.
While at it, I added debug logging of HardwareError, it might be useful
for someone.
Note 1: I recommend viewing the second commit ignoring whitespace, it makes the diff clearer.
Note 2: I don't have a multi-slot reader, so I wasn't able to test the
Multi_
code paths.