iwmc3200wifi: fix NULL pointer dereference in pmkid update
When handling IWM_CMD_PMKID_FLUSH command, the bssid and pmkid in pmksa are all NULL. Check it before memcpy. Signed-off-by: NZhu Yi <yi.zhu@intel.com> Acked-by: NSamuel Ortiz <sameo@linux.intel.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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