One MXC patch for -rc

[Valentin Longchamp]

I had sent this patch in August and since it is quite trivial, very
useful and was already reviewed, it would be nice to include it for -rc4.

Btw Sascha, you have not updated your mxc git tree in a while. Do you
still want to do it or the prefered reference branch for MXC that now
most of things are in place is Linus's master branch (as for ARM) ?

Best Regards,

Val