Fix failed in loading wasm byte-code if return NULL while size == 0 in os_malloc (#500)
Fix failed in loading wasm byte-code if return NULL while size == 0 in os_malloc (#500)


bytecodealliance/wasm-micro-runtime,bytecodealliance/wasm-micro-runtime,bytecodealliance/wasm-micro-runtime,bytecodealliance/wasm-micro-runtime,bytecodealliance/wasm-micro-runtime,bytecodealliance/wasm-micro-runtime,bytecodealliance/wasm-micro-runtime,bytecodealliance/wasm-micro-runtime