pinctrl: stm32: Add check for devm_kcalloc

Add check for the return value of devm_kcalloc() and return the error
if it fails in order to avoid NULL pointer dereference.

Fixes: 32c170f ("pinctrl: stm32: set default gpio line names using pin names")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Acked-by: Valentin Caron <valentin.caron@foss.st.com>
Link: https://lore.kernel.org/r/20231031080807.3600656-1-nichen@iscas.ac.cn
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: Chen Ni

drivers/pinctrl/stm32/pinctrl-stm32.c

@@ -1368,6 +1368,11 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode
 	}
 
 	names = devm_kcalloc(dev, npins, sizeof(char *), GFP_KERNEL);
+	if (!names) {
+		err = -ENOMEM;
+		goto err_clk;
+	}
+
 	for (i = 0; i < npins; i++) {
 		stm32_pin = stm32_pctrl_get_desc_pin_from_gpio(pctl, bank, i);
 		if (stm32_pin && stm32_pin->pin.name)