new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/omfs/dir.c b/fs/omfs/dir.c
index fb5b3ff..acbaebc 100644
--- a/fs/omfs/dir.c
+++ b/fs/omfs/dir.c
@@ -330,7 +330,7 @@
 static int omfs_fill_chain(struct file *filp, void *dirent, filldir_t filldir,
 		u64 fsblock, int hindex)
 {
-	struct inode *dir = filp->f_dentry->d_inode;
+	struct inode *dir = file_inode(filp);
 	struct buffer_head *bh;
 	struct omfs_inode *oi;
 	u64 self;
@@ -405,7 +405,7 @@
 
 static int omfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 {
-	struct inode *dir = filp->f_dentry->d_inode;
+	struct inode *dir = file_inode(filp);
 	struct buffer_head *bh;
 	loff_t offset, res;
 	unsigned int hchain, hindex;