script: Fix reference into empty vector run time exception

Edit by laanwj: `begin_ptr(sourcedata) + sourcedata.size()` -> `end_ptr(sourcedata)`

src/script/interpreter.cpp

@@ -637,15 +637,15 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     valtype& vch = stacktop(-1);
                     valtype vchHash((opcode == OP_RIPEMD160 || opcode == OP_SHA1 || opcode == OP_HASH160) ? 20 : 32);
                     if (opcode == OP_RIPEMD160)
-                        CRIPEMD160().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+                        CRIPEMD160().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
                     else if (opcode == OP_SHA1)
-                        CSHA1().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+                        CSHA1().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
                     else if (opcode == OP_SHA256)
-                        CSHA256().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+                        CSHA256().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
                     else if (opcode == OP_HASH160)
-                        CHash160().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+                        CHash160().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
                     else if (opcode == OP_HASH256)
-                        CHash256().Write(&vch[0], vch.size()).Finalize(&vchHash[0]);
+                        CHash256().Write(begin_ptr(vch), vch.size()).Finalize(begin_ptr(vchHash));
                     popstack(stack);
                     stack.push_back(vchHash);
                 }

src/test/base58_tests.cpp

@@ -40,7 +40,7 @@ BOOST_AUTO_TEST_CASE(base58_EncodeBase58)
         std::vector<unsigned char> sourcedata = ParseHex(test[0].get_str());
         std::string base58string = test[1].get_str();
         BOOST_CHECK_MESSAGE(
-                    EncodeBase58(&sourcedata[0], &sourcedata[sourcedata.size()]) == base58string,
+                    EncodeBase58(begin_ptr(sourcedata), end_ptr(sourcedata)) == base58string,
                     strTest);
     }
 }