brcmfmac: check return from kzalloc in brcmf_fweh_process_event

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Arend van Spriel <arend@broadcom.com>

drivers/net/wireless/brcm80211/brcmfmac/fweh.c

@@ -494,6 +494,9 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr,
 		alloc_flag = GFP_ATOMIC;
 
 	event = kzalloc(sizeof(*event) + datalen, alloc_flag);
+	if (!event)
+		return;
+
 	event->code = code;
 	event->ifidx = *ifidx;