new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/sbus/char/display7seg.c b/drivers/sbus/char/display7seg.c
index e85c803..fc1339c 100644
--- a/drivers/sbus/char/display7seg.c
+++ b/drivers/sbus/char/display7seg.c
@@ -107,7 +107,7 @@
 	int error = 0;
 	u8 ireg = 0;
 
-	if (D7S_MINOR != iminor(file->f_path.dentry->d_inode))
+	if (D7S_MINOR != iminor(file_inode(file)))
 		return -ENODEV;
 
 	mutex_lock(&d7s_mutex);