Fix race condition in NimBLEScan::clearResults. #855
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If clear results is called from more than one task a race condition exists that may delete the same advertisedDevice twice. This prevents this by swapping with an empty vector and testing for empty before freeing the resources.
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If clear results is called from more than one task a race condition exists that may delete the same advertisedDevice twice. This prevents this by swapping with an empty vector and testing for empty before freeing the resources.