Uninitialized array variable

Uninitialized array variable

array"key" is uninitialized and it is being read directly in function SipHash_Init() as per the below statements making a way for the garbage values :
uint64_t k0 = U8TO64_LE(k);
uint64_t k1 = U8TO64_LE(k + 8);

CLA: trivial

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23298)