Revert "Fix error checking in MemoryFile."

        jint length, jint prot)

{

    int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);

    void* result = mmap(NULL, length, prot, MAP_SHARED, fd, 0);

    if (result == MAP_FAILED) {

    jint result = (jint)mmap(NULL, length, prot, MAP_SHARED, fd, 0);

    if (!result)

        jniThrowException(env, "java/io/IOException", "mmap failed");

    }

    return reinterpret_cast<jlong>(result);

    return result;

}

static void android_os_MemoryFile_munmap(JNIEnv* env, jobject clazz, jint addr, jint length)

{

    int result = munmap(reinterpret_cast<void *>(addr), length);

    int result = munmap((void *)addr, length);

    if (result < 0)

        jniThrowException(env, "java/io/IOException", "munmap failed");

}