script: Replace address-of idiom with vector data() method

src/script/sigcache.cpp

@@ -53,7 +53,7 @@ public:
     ComputeEntryECDSA(uint256& entry, const uint256 &hash, const std::vector<unsigned char>& vchSig, const CPubKey& pubkey) const
     {
         CSHA256 hasher = m_salted_hasher_ecdsa;
-        hasher.Write(hash.begin(), 32).Write(&pubkey[0], pubkey.size()).Write(&vchSig[0], vchSig.size()).Finalize(entry.begin());
+        hasher.Write(hash.begin(), 32).Write(&pubkey[0], pubkey.size()).Write(vchSig.data(), vchSig.size()).Finalize(entry.begin());
     }
 
     void