new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/char/sonypi.c b/drivers/char/sonypi.c
index d780295..8450e17 100644
--- a/drivers/char/sonypi.c
+++ b/drivers/char/sonypi.c
@@ -938,7 +938,7 @@
 	}
 
 	if (ret > 0) {
-		struct inode *inode = file->f_path.dentry->d_inode;
+		struct inode *inode = file_inode(file);
 		inode->i_atime = current_fs_time(inode->i_sb);
 	}