Safety check to prevent crash on Mac OS#1

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szszszsz wants to merge 1 commit intoNitrokey:masterfrom

Timac:SafetyCheckCFSetGetCount

Commits on Sep 25, 2017

I have seen several crashes on macOS 10.12.6 caused by the fact that IOHIDManagerCopyDevices() returned NULL. Calling CFSetGetCount() on a NULL CFSetRef causes a crash. The fix consists of checking…
Alexandre Colucci
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