remove the dma_set_{max_seg_size,seg_boundary,min_align_mask} return value v2

[Martin K. Petersen]

Christoph,

> the above three functions can only return errors if the bus code
> failed to allocate the dma_parms structure, which is a grave error
> that won't get us far. Thus remove the pointless return values, that
> so far have fortunately been mostly ignored, but which the cleanup
> brigade now wants to check for for no good reason.

Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering