mmc: block: Change mmc_apply_rel_rw() to get block address from the request

mmc_apply_rel_rw() will be used by Software Command Queuing also. In that
case the command argument is not the block address so change
mmc_apply_rel_rw() to get block address from the request.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/core/block.c

@@ -1309,7 +1309,7 @@ static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
 {
 	if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
 		/* Legacy mode imposes restrictions on transfers. */
-		if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
+		if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
 			brq->data.blocks = 1;
 
 		if (brq->data.blocks > card->ext_csd.rel_sectors)