extcon: ptn5150: Deduplicate parts of dev_err_probe()

dev_err_probe() is designed to be used like

	return dev_err_probe(dev, ret, "Error message\n");

Hence no need to have a separate return statement. Besides that
dev_err_probe() prints already returned error code, no need to repeat
that either.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>