fs/hugetlbfs/inode.c: add static to hugetlbfs_i_mmap_mutex_key

hugetlbfs_i_mmap_mutex_key is only used in inode.c
Signed-off-by: NFabian Frederick <fabf@skynet.be>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/hugetlbfs/inode.c

@@ -477,7 +477,7 @@ static struct inode *hugetlbfs_get_root(struct super_block *sb,
  * annotation because huge_pmd_share() does an allocation under
  * i_mmap_mutex.
  */
-struct lock_class_key hugetlbfs_i_mmap_mutex_key;
+static struct lock_class_key hugetlbfs_i_mmap_mutex_key;
 
 static struct inode *hugetlbfs_get_inode(struct super_block *sb,
 					struct inode *dir,