new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 71a600a..6599222 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -30,7 +30,7 @@
 
 static int setfl(int fd, struct file * filp, unsigned long arg)
 {
-	struct inode * inode = filp->f_path.dentry->d_inode;
+	struct inode * inode = file_inode(filp);
 	int error = 0;
 
 	/*