klee: fixed z3 api

Signed-off-by: Vitaly Chipounov <vitaly@chipounov.fr>

Author: vitalych

klee/lib/Solver/Z3Solver.cpp

@@ -233,8 +233,8 @@ void Z3BaseSolverImpl::extractModel(const ArrayVec &objects, std::vector<std::ve
             z3::expr value_ast = model.eval(builder_->getInitialRead(array, offset), true);
             unsigned value_num;
 
-            Z3_bool conv_result = Z3_get_numeral_uint(context_, value_ast, &value_num);
-            ::check(conv_result == Z3_TRUE, "Could not convert value");
+            auto conv_result = Z3_get_numeral_uint(context_, value_ast, &value_num);
+            ::check(conv_result, "Could not convert value");
             assert(value_num < (1 << 8 * sizeof(unsigned char)) && "Invalid model value");
 
             data.push_back((unsigned char) value_num);