The function fopen() may fail, so check its return value.
Signed-off-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: NLi Liu <john.liuli@huawei.com>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>