[PATCH] regulator: core: avoid unused variable warning

[Mark Brown]

On Fri, Oct 09, 2015 at 02:36:47PM +0200, Arnd Bergmann wrote:

> The second argument of the mutex_lock_nested() helper is only
> evaluated if CONFIG_DEBUG_LOCK_ALLOC is set. Otherwise we
> get this build warning for the new regulator_lock_supply
> function:

Shouldn't we have an annotation or something for this in
mutex_lock_nested()?  It seems like something that might come up
elsewhere and it's a bit of a surprise to have one of the arguments
there not be evaluated.
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