new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
index 99e3610..aa411c3 100644
--- a/fs/ntfs/dir.c
+++ b/fs/ntfs/dir.c
@@ -1101,7 +1101,7 @@
 {
 	s64 ia_pos, ia_start, prev_ia_pos, bmp_pos;
 	loff_t fpos, i_size;
-	struct inode *bmp_vi, *vdir = filp->f_path.dentry->d_inode;
+	struct inode *bmp_vi, *vdir = file_inode(filp);
 	struct super_block *sb = vdir->i_sb;
 	ntfs_inode *ndir = NTFS_I(vdir);
 	ntfs_volume *vol = NTFS_SB(sb);