drivers/block/null_blk_main.c: fix layout

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/block/null_blk_main.c

@@ -274,12 +274,12 @@ static ssize_t									\
 nullb_device_##NAME##_store(struct config_item *item, const char *page,	\
 			    size_t count)				\
 {									\
-	int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;	\
+	int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\
 	struct nullb_device *dev = to_nullb_device(item);		\
 	TYPE new_value;							\
 	int ret;							\
 									\
-	ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);	\
+	ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\
 	if (ret < 0)							\
 		return ret;						\
 	if (apply_fn)							\