re: ath: Add support for tracing

[Dan Carpenter <dan.carpenter@oracle.com>]

Hello Sujith Manoharan,

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

The patch e6664dff0608: "ath: Add support for tracing" from Sep 27, 
2014, leads to the following Smatch complaint:

drivers/net/wireless/ath/main.c:88 ath_printk()
	 error: we previously assumed 'common->hw' could be null (see line 82)

drivers/net/wireless/ath/main.c
    81	
    82		if (common && common->hw && common->hw->wiphy)
                              ^^^^^^^^^^
Existing code assumes common->hw can be NULL.

    83			printk("%sath: %s: %pV",
    84			       level, wiphy_name(common->hw->wiphy), &vaf);
    85		else
    86			printk("%sath: %pV", level, &vaf);
    87	
    88		trace_ath_log(common->hw->wiphy, &vaf);
                              ^^^^^^^^^^^^^^^^^
New code dereferences it without checking for NULL.

    89	
    90		va_end(args);

regards,
dan carpenter