extcon: max14577: Properly handle regmap_irq_get_virq error

The regmap_irq_get_virq may return 0 or -EINVAL on error. Fail the probe
in both situations.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>