block: cleanup queue_wc_store

Get rid of the local queue_wc_store variable and handling setting and
clearing the QUEUE_FLAG_WC flag diretly instead the if / else if.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230707094239.107968-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-sysfs.c

@@ -449,21 +449,13 @@ static ssize_t queue_wc_show(struct request_queue *q, char *page)
 static ssize_t queue_wc_store(struct request_queue *q, const char *page,
 			      size_t count)
 {
-	int set = -1;
-
 	if (!strncmp(page, "write back", 10))
-		set = 1;
+		blk_queue_flag_set(QUEUE_FLAG_WC, q);
 	else if (!strncmp(page, "write through", 13) ||
 		 !strncmp(page, "none", 4))
-		set = 0;
-
-	if (set == -1)
-		return -EINVAL;
-
-	if (set)
-		blk_queue_flag_set(QUEUE_FLAG_WC, q);
-	else
 		blk_queue_flag_clear(QUEUE_FLAG_WC, q);
+	else
+		return -EINVAL;
 
 	return count;
 }