Input: adp5588-keys - do not check for irq presence

There's no need for an extra check for 'client-irq'. Just let it fail when
calling 'request_irq()'.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220829131553.690063-7-nuno.sa@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/adp5588-keys.c

@@ -728,11 +728,6 @@ static int adp5588_probe(struct i2c_client *client,
 		return -EIO;
 	}
 
-	if (!client->irq) {
-		dev_err(&client->dev, "no IRQ?\n");
-		return -EINVAL;
-	}
-
 	kpad = devm_kzalloc(&client->dev, sizeof(*kpad), GFP_KERNEL);
 	if (!kpad)
 		return -ENOMEM;