[PATCH RESEND] lib/mpi: fix build with clang

[Herbert Xu]

On Mon, Aug 07, 2017 at 10:31:20AM -0700, Stefan Agner wrote:
> Use just @ to denote comments which works with gcc and clang.
> Otherwise clang reports an escape sequence error:
>   error: invalid % escape in inline assembly string
> 
> Use %0-%3 as operand references, this avoids:
>   error: invalid operand in inline asm: 'umull ${1:r}, ${0:r}, ${2:r}, ${3:r}'
> 
> Also remove superfluous casts on output operands to avoid warnings
> such as:
>   warning: invalid use of a cast in an inline asm context requiring an l-value
> 
> Signed-off-by: Stefan Agner <stefan at agner.ch>
> Acked-by: Arnd Bergmann <arnd at arndb.de>

Patch applied.  Thanks.
-- 
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