[PATCH] ps3-vuart: BUG_ON on null drv before dereferencing it on dev_dbg

[Geoff Levand]

On Tue, 2015-09-01 at 11:21 +0100, Colin King wrote:
> On the unlikely event that drv is null, the current code will
> perform a null pointer dereference with it when printing a dev_dbg
> message.  Instead, the BUG_ON check on drv should be performed
> before we emit the dev_dbg message.
> 
> Signed-off-by: Colin Ian King <colin.king at canonical.com>

I applied this to my ps3-linux repo.  I can update it if you decide to
do the other fixes Geert mentioned.

-Geoff