pinctrl: rockchip: return ENOMEM instead of EINVAL if allocation fails

The function rockchip_pinctrl_parse_dt returns -EINVAL if
allocation fails. Change the return error to -ENOMEM

Signed-off-by: Dafna Hirschfeld <[e-mail]>
Reviewed-by: Heiko Stuebner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-rockchip.c

···
 					      sizeof(struct rockchip_pmx_func),
 					      GFP_KERNEL);
 	if (!info->functions)
-		return -EINVAL;
+		return -ENOMEM;
 
 	info->groups = devm_kcalloc(dev,
 					    info->ngroups,
 					    sizeof(struct rockchip_pin_group),
 					    GFP_KERNEL);
 	if (!info->groups)
-		return -EINVAL;
+		return -ENOMEM;
 
 	i = 0;