Romain Guy 15a65bfee5 Remove unnecessary & uninitialized variable
Bug #7728929

The uninitialized variable was taken into account to compute
the hash of gradient cache entries, thus causing cache corruptions
and sometimes infinite loops (it would also cause the cache to fill
up.)

Change-Id: Ic807a9bf901888b121a6a781a81dafc33075ed2a
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