V4L/DVB: media/IR: testing the wrong variable

There is a typo here.  We meant to test "rbuf" instead of "drv".  We
already tested "drv" earlier.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Acked-by: NJarod Wilson <jarod@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/IR/ir-lirc-codec.c

@@ -187,7 +187,7 @@ static int ir_lirc_register(struct input_dev *input_dev)
 		return rc;
 
 	rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
-	if (!drv)
+	if (!rbuf)
 		goto rbuf_alloc_failed;
 
 	rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);