[PATCH] drm/atomic-helper: Use bitwise or for filling a bitmask

[Eric Anholt]

Ville Syrjala <ville.syrjala at linux.intel.com> writes:

> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Using += to set the bits in a mask looks funny. It works in this case
> because we never set the same bit twice. But let's switch to |= to
> make this look more regular.

Reviewed-by: Eric Anholt <eric at anholt.net>
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