HID: picoLCD: fix a NULL test in picolcd_raw_cir()

Smatch complains that the NULL checking in this function is not
consistent and could lead to a NULL dereference.  The comments say that
we should return here if rc_dev is NULL so I've changed the test to
match the comment.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NBruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-picolcd_cir.c

@@ -51,7 +51,7 @@ int picolcd_raw_cir(struct picolcd_data *data,
 
 	/* ignore if rc_dev is NULL or status is shunned */
 	spin_lock_irqsave(&data->lock, flags);
-	if (data->rc_dev && (data->status & PICOLCD_CIR_SHUN)) {
+	if (!data->rc_dev || (data->status & PICOLCD_CIR_SHUN)) {
 		spin_unlock_irqrestore(&data->lock, flags);
 		return 1;
 	}