new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 6b9f921..074e045 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -122,7 +122,7 @@
 
 static int hfsplus_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;
 	int len, err;
 	char strbuf[HFSPLUS_MAX_STRLEN + 1];