WaiterThread will spin and crash device

[swilson]

If another app forcibly claims the UsbInterface, deviceConnection.bulkTransfer will immediately return -1 causing the MidiInputDevice WaiterThread to spin forever at thread priority 8. This will eventually lock up and crash most devices; the LAST KMSG bugreport logs are full of:

[11053.427626] usb 1-1: usbfs: process 7851 (2].WaiterThread) did not claim interface 3 before use

Fixed here by adding an error counter to the WaiterThread and bailing if it reaches an arbitrary watermark. Not ideal; really the whole stack should shut down if the interface gets claimed by someone else (kind of ridiculous the Android API allows this to occur in the first place).