bdev: make blockdev_mnt static

The blockdev_mnt are not used outside the file bdev.c, so the modification
is defined as static.

block/bdev.c:377:17: warning: symbol 'blockdev_mnt' was not declared. Should it be static?

Reported-by: Abaci Robot <[email protected]>
jpg: Remove closes bugzilla link
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jiapeng Chong <[email protected]>
Signed-off-by: John Garry <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Fixes: 8f3a608827d1 ("bdev: open block device as files")
Tested-by: John Garry <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Jiapeng Chong

block/bdev.c

@@ -385,7 +385,7 @@ static struct file_system_type bd_type = {
 };
 
 struct super_block *blockdev_superblock __ro_after_init;
-struct vfsmount *blockdev_mnt __ro_after_init;
+static struct vfsmount *blockdev_mnt __ro_after_init;
 EXPORT_SYMBOL_GPL(blockdev_superblock);
 
 void __init bdev_cache_init(void)