[bug report] coresight: etm: Clean up device specific data

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Hello Suzuki K Poulose,

This is a semi-automatic email about new static checker warnings.

The patch 21d26b905c05: "coresight: etm: Clean up device specific 
data" from May 22, 2019, leads to the following Smatch complaint:

    ./drivers/hwtracing/coresight/coresight-etm3x.c:460 etm_get_trace_id()
    warn: variable dereferenced before check 'drvdata' (see line 458)

./drivers/hwtracing/coresight/coresight-etm3x.c
   457		int trace_id = -1;
   458		struct device *etm_dev = drvdata->csdev->dev.parent;
                                         ^^^^^^^^^
New dereference

   459	
   460		if (!drvdata)
                    ^^^^^^^^
Checked too late.  Delete the check?

   461			goto out;
   462	

regards,
dan carpenter