Regression caused by a603a2b8d86e "gpio: of: Add special quirk to parse regulator flags"

[Heiner Kallweit <hkallweit1@xxxxxxxxx>]

With the latest next kernel I get a NPE caused by mentioned commit.
The change doesn't consider that the flags parameter can be NULL,
e.g. of_get_named_gpio() sets it to NULL.
All that of_gpio_flags_quirks() does is adjusting the flags,
so the following simple change fixed the issue for me.

if (flags)
	of_gpio_flags_quirks(np, flags);
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