Fix heap corruption in CryptAcquireContext

[Michael Jung]

Greetings,
Michael

Changelog:
	Prevents a heap corruption for the case that CPAcquireContext 
	fails to open a container.
-- 
Michael Jung, MSc                               Be liberal in what you accept,
Integrated Circuits and Systems Lab         and conservative in what you send. 
University of Technology, Darmstadt       -- Jonathan Postel, Internet Pioneer
phone: +49(6151)16-6692 / email: mjung at iss.tu-darmstadt.de
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