phy: exynos5-usbdrd: fix error code in probe()

Return negative -ENOMEM instead of positive ENOMEM.

Fixes: 497ddafe ("phy: exynos5-usbdrd: convert Vbus supplies to regulator_bulk")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: André Draszik <andre.draszik@linaro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/a956a3e2-c6ce-4f07-ad80-ec8a96e00d16@stanley.mountain


Signed-off-by: Vinod Koul <vkoul@kernel.org>