new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/squashfs/dir.c b/fs/squashfs/dir.c
index b381305..57dc70e 100644
--- a/fs/squashfs/dir.c
+++ b/fs/squashfs/dir.c
@@ -102,7 +102,7 @@
 
 static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 {
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
 	u64 block = squashfs_i(inode)->start + msblk->directory_table;
 	int offset = squashfs_i(inode)->offset, length, dir_count, size,