Input: synaptics-rmi4 - remove redundant null check on rmi_dev

rmi_dev is currently being dereferenced before it null checked, however,
after deeper inspecting, rmi_dev can never be null, so just remove this
redundant check.

Fixes CoverityScan CID 1391218 ("Dereference before null check")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/rmi4/rmi_f03.c

@@ -175,9 +175,6 @@ static int rmi_f03_attention(struct rmi_function *fn, unsigned long *irq_bits)
 	int i;
 	int error;
 
-	if (!rmi_dev)
-		return -ENODEV;
-
 	if (drvdata->attn_data.data) {
 		/* First grab the data passed by the transport device */
 		if (drvdata->attn_data.size < ob_len) {