Redo a mis-fix of a memory leak in r9919: I added sfree(data)

[sgt/putty] / LICENCE

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Portions copyright Robert de Bath, Joris van Rantwijk, Delian
Delchev, Andreas Schultz, Jeroen Massar, Wez Furlong, Nicolas Barry,
Justin Bradford, Ben Harris, Malcolm Smith, Ahmad Khalifa, Markus
Kuhn, Colin Watson, and CORE SDI S.A.

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