[PATCH] mm: fix noisy sparse warning in LIBCFS_ALLOC_PRE()

[Al Viro]

On Sat, Dec 26, 2015 at 09:12:42PM -0800, Joshua Clayton wrote:
> running sparse on drivers/staging/lustre results in dozens of warnings:
> include/linux/gfp.h:281:41: warning:
> odd constant _Bool cast (400000 becomes 1)
> 
> Use "!!" to explicitly convert the result to bool range.

... and the cast to bool is left in order to...?

> -	return (bool __force)(gfp_flags & __GFP_DIRECT_RECLAIM);
> +	return (bool __force)!!(gfp_flags & __GFP_DIRECT_RECLAIM);