dm: declare variables static when sensible

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

drivers/md/dm-cache-target.c

@@ -859,7 +859,7 @@ static const char *cache_device_name(struct cache *cache)
 
 static void notify_mode_switch(struct cache *cache, enum cache_metadata_mode mode)
 {
-	const char *descs[] = {
+	static const char *descs[] = {
 		"write",
 		"read-only",
 		"fail"

drivers/md/dm-thin.c

@@ -294,7 +294,7 @@ static enum pool_mode get_pool_mode(struct pool *pool)
 
 static void notify_of_pool_mode_change(struct pool *pool)
 {
-	const char *descs[] = {
+	static const char *descs[] = {
 		"write",
 		"out-of-data-space",
 		"read-only",