server: return NULL from device_open_file on failure to allocate fd

[Sebastian Lackner]

On 20.06.2015 00:22, Daniel Lehman wrote:
> 
> 

Does this patch address a real issue or is it just by looking at the source?
&file->obj should not lead to an invalid memory access because its just a more
convenient way to do a type conversion. If file == NULL, then &file->obj will
also be NULL. Of course its a matter of taste what is easier to read.

Regards,
Sebastian