test: Prevent UB in minisketch_tests.cpp

Author: hebasto

src/test/minisketch_tests.cpp

@@ -40,7 +40,7 @@ BOOST_AUTO_TEST_CASE(minisketch_test)
         Minisketch sketch_c = std::move(sketch_ar);
         sketch_c.Merge(sketch_br);
         auto dec = sketch_c.Decode(errors);
-        BOOST_CHECK(dec.has_value());
+        BOOST_REQUIRE(dec.has_value());
         auto sols = std::move(*dec);
         std::sort(sols.begin(), sols.end());
         for (uint32_t i = 0; i < a_not_b; ++i) BOOST_CHECK_EQUAL(sols[i], start_a + i);