block: mark block_depr static

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/genhd.c

@@ -27,7 +27,7 @@
 #include "blk.h"
 
 static DEFINE_MUTEX(block_class_lock);
-struct kobject *block_depr;
+static struct kobject *block_depr;
 
 /* for extended dynamic devt allocation, currently only one major is used */
 #define NR_EXT_DEVT		(1 << MINORBITS)

include/linux/genhd.h

@@ -27,7 +27,6 @@
 #define part_to_dev(part)	(&((part)->__dev))
 
 extern struct device_type part_type;
-extern struct kobject *block_depr;
 extern struct class block_class;
 
 #define DISK_MAX_PARTS			256