[yocto] QEmu Script Error Checking

[Jack Mitchell]

I have run into the following issue where the tap device is in use due 
to the QEmu machine unexpectedly crashing. The error I recieve is here:

http://i.imgur.com/5t9U1.png (appologies for the screenshot but it 
wouldn't let me copy the text)

Is there any leaway for more robust error checking or a way to forcibly 
destroy the tap node to allow a new one to be created?

Cheers,
Jack.