Fix possible null dereference for Leadtek DTV 3200H

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Fix possible null dereference for Leadtek DTV 3200H XC4000 tuner when
no firmware file available.
From 173991a979f5f75dbbaf38f1b053d50043a40729 Mon Sep 17 00:00:00 2001
From: Miroslav Slugeň <thunder.m@xxxxxxxx>
Date: Sun, 11 Dec 2011 22:57:58 +0100
Subject: [PATCH] Fix possible null dereference for Leadtek DTV 3200H XC4000 tuner when no firmware file available.

---
 drivers/media/video/cx23885/cx23885-dvb.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/media/video/cx23885/cx23885-dvb.c b/drivers/media/video/cx23885/cx23885-dvb.c
index bcb45be..f0482b2 100644
--- a/drivers/media/video/cx23885/cx23885-dvb.c
+++ b/drivers/media/video/cx23885/cx23885-dvb.c
@@ -940,6 +940,11 @@ static int dvb_register(struct cx23885_tsport *port)
 
 			fe = dvb_attach(xc4000_attach, fe0->dvb.frontend,
 					&dev->i2c_bus[1].i2c_adap, &cfg);
+			if (!fe) {
+				printk(KERN_ERR "%s/2: xc4000 attach failed\n",
+				       dev->name);
+				goto frontend_detach;
+			}
 		}
 		break;
 	case CX23885_BOARD_TBS_6920:
-- 
1.7.2.3


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