Prevent NULL dereference if kmalloc() fails.

Signed-off-by: Roel Kluin <roel.kl...@gmail.com>
---
Found with sed: http://kernelnewbies.org/roelkluin

Build tested.

diff --git a/drivers/media/dvb/dvb-usb/m920x.c 
b/drivers/media/dvb/dvb-usb/m920x.c
index aec7a19..ef9b7be 100644
--- a/drivers/media/dvb/dvb-usb/m920x.c
+++ b/drivers/media/dvb/dvb-usb/m920x.c
@@ -337,6 +337,8 @@ static int m920x_firmware_download(struct usb_device *udev, 
const struct firmwar
        int i, pass, ret = 0;
 
        buff = kmalloc(65536, GFP_KERNEL);
+       if (buff == NULL)
+               return -ENOMEM;
 
        if ((ret = m920x_read(udev, M9206_FILTER, 0x0, 0x8000, read, 4)) != 0)
                goto done;
--
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