Fix pedantic Linux warning treated as error.

tests/fuzzers/VertexRoutineFuzzer.cpp

@@ -205,7 +205,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
 	sw::Routine *routine = program(L"VertexRoutine");
 	assert(routine);
 	const void *entry = routine->getEntry();
-	assert(entry);
+	assert(entry); (void)entry;
 	delete routine;
 
 	return 0;