new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index c6c3f91..3ceb9ec 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -351,7 +351,7 @@
  */
 static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 {
-	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct inode *inode = file_inode(filp);
 	struct super_block *sb = inode->i_sb;
 	char *buf;
 	unsigned int offset;