tests don't check for NULL return value of Pa_GetDeviceInfo()

[rossb]

Pa_GetDeviceInfo() returns NULL on error (usually an invalid device index is passed)

Many tests have code similar to: Pa_GetDeviceInfo( Pa_GetDefaultOutputDevice() )->defaultLowOutputLatency;

Which will segfault if there is no default device (ie when Pa_GetDefaultOutputDevice() returns -1).

All tests and code should be corrected to check for a valid pointer return from Pa_GetDeviceInfo(), and also for a positive result from GetDefault?*Device().

[rossb]

Magnus Jonsson used the following technique to fix this in paqa_errs.c in r1368

+ info = Pa_GetDeviceInfo(Pa_GetDefaultInputDevice()); + ipp.suggestedLatency = info ? info->defaultLowInputLatency : 0.100; + info = Pa_GetDeviceInfo(Pa_GetDefaultOutputDevice()); + opp.suggestedLatency = info ? info->defaultLowOutputLatency : 0.100;