Merge "libcutils: fallback to /dev/ashmem"

{

    static const std::string ashmem_device_path = get_ashmem_device_path();

    int ret;

    struct stat st;

    if (ashmem_device_path.empty()) {

        return -1;

    }

    int fd = TEMP_FAILURE_RETRY(open(ashmem_device_path.c_str(), O_RDWR | O_CLOEXEC));

    // fallback for APEX w/ use_vendor on Q, which would have still used /dev/ashmem

    if (fd < 0) {

        fd = TEMP_FAILURE_RETRY(open("/dev/ashmem", O_RDWR | O_CLOEXEC));

    }

    if (fd < 0) {

        return fd;

    }

    ret = TEMP_FAILURE_RETRY(fstat(fd, &st));

    struct stat st;

    int ret = TEMP_FAILURE_RETRY(fstat(fd, &st));

    if (ret < 0) {

        int save_errno = errno;

        close(fd);