dm: avoid initializing static variables

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

drivers/md/dm-bufio.c

@@ -216,7 +216,7 @@ static DEFINE_SPINLOCK(global_spinlock);
 
 static LIST_HEAD(global_queue);
 
-static unsigned long global_num = 0;
+static unsigned long global_num;
 
 /*
  * Buffers are freed after this timeout

drivers/md/dm-crypt.c

@@ -230,7 +230,7 @@ struct crypt_config {
 #define POOL_ENTRY_SIZE	512
 
 static DEFINE_SPINLOCK(dm_crypt_clients_lock);
-static unsigned int dm_crypt_clients_n = 0;
+static unsigned int dm_crypt_clients_n;
 static volatile unsigned long dm_crypt_pages_per_client;
 #define DM_CRYPT_MEMORY_PERCENT			2
 #define DM_CRYPT_MIN_PAGES_PER_CLIENT		(BIO_MAX_VECS * 16)

drivers/md/dm-raid.c

@@ -30,7 +30,7 @@
  */
 #define	MIN_RAID456_JOURNAL_SPACE (4*2048)
 
-static bool devices_handle_discard_safely = false;
+static bool devices_handle_discard_safely;
 
 /*
  * The following flags are used by dm-raid.c to set up the array state.

drivers/md/dm.c

@@ -50,8 +50,8 @@
 
 static const char *_name = DM_NAME;
 
-static unsigned int major = 0;
-static unsigned int _major = 0;
+static unsigned int major;
+static unsigned int _major;
 
 static DEFINE_IDR(_minor_idr);