[PATCH] mmc: fix card block compile warnings

["Linus Walleij" <linus.walleij@xxxxxxxxxx>]

I'm pretty tired of seeing these in my kernel compiles:
drivers/mmc/card/block.c: In function ‘mmc_blk_issue_secdiscard_rq’:
drivers/mmc/card/block.c:911:18: warning: ‘arg’ may be used uninitialized in this function [-Wuninitialized]
drivers/mmc/card/block.c:910:6: warning: ‘nr’ may be used uninitialized in this function [-Wuninitialized]
drivers/mmc/card/block.c:910:6: warning: ‘from’ may be used uninitialized in this function [-Wuninitialized]

This patch marks the variables explicitly uninitialized as
seems to be the intention, I can assure myself they are not
actually uninitialized at use time by just reading the code.

Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/mmc/card/block.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index c6a383d..214ae68 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -874,7 +874,9 @@ static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 {
 	struct mmc_blk_data *md = mq->data;
 	struct mmc_card *card = md->queue.card;
-	unsigned int from, nr, arg;
+	unsigned int uninitialized_var(from);
+	unsigned int uninitialized_var(nr);
+	unsigned int uninitialized_var(arg);
 	int err = 0, type = MMC_BLK_SECDISCARD;
 
 	if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
-- 
1.7.7.6

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