loader: fix NEGATIVE_RETURNS
lseek will return -1 on error, g_malloc0(size) and read(,,size) paramenters cannot be negative. We should add a check for return value of lseek(). Signed-off-by: NGonglei <arei.gonglei@huawei.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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