pinctrl: at91-pio4: drop useless check in atmel_conf_pin_config_dbg_show()

In atmel_conf_pin_config_dbg_show(), checking atmel_pioctrl->pins[pin_id]
against being NULL doesn't make any sense as it gets derefenced first and
the driver's probe() method immediately returns -ENOMEM when devm_kzalloc()
returns NULL for any atmel_pioctrl->pins[] element anyway, thus failing to
register the device...

Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/4ab2f59f-45c1-76a2-94da-3331e8ec4e35@omp.ruSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-at91-pio4.c

@@ -939,10 +939,9 @@ static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
 	if (!atmel_pioctrl->pins[pin_id]->device)
 		return;
 
-	if (atmel_pioctrl->pins[pin_id])
-		seq_printf(s, " (%s, ioset %u) ",
-			   atmel_pioctrl->pins[pin_id]->device,
-			   atmel_pioctrl->pins[pin_id]->ioset);
+	seq_printf(s, " (%s, ioset %u) ",
+		   atmel_pioctrl->pins[pin_id]->device,
+		   atmel_pioctrl->pins[pin_id]->ioset);
 
 	conf = atmel_pin_config_read(pctldev, pin_id);
 	if (conf & ATMEL_PIO_PUEN_MASK)