pinctrl: propagate map validation errors

pinctrl_register_map() was returning early if pinmux_validate_map() or
pinconf_validate_map() failed, but was not actually returning the error
code.

Signed-off-by: Stephen Warren <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/core.c

···
 		case PIN_MAP_TYPE_MUX_GROUP:
 			ret = pinmux_validate_map(&maps[i], i);
 			if (ret < 0)
-				return 0;
+				return ret;
 			break;
 		case PIN_MAP_TYPE_CONFIGS_PIN:
 		case PIN_MAP_TYPE_CONFIGS_GROUP:
 			ret = pinconf_validate_map(&maps[i], i);
 			if (ret < 0)
-				return 0;
+				return ret;
 			break;
 		default:
 			pr_err("failed to register map %s (%d): invalid type given\n",