c0ad07b190
The GUIDs we usually deal with should be considered constant. Hence make them so. Unfortunately the prototypes for various functions doesn't mark them as const (but still decorates them with "IN", clarifying they are input-only), hence we need to cast things at various places. We already cast in similar fashion in many other cases, hence unify things here in one style. Making the EFI_GUID constant (and in particular so when specified in C99 compound literal style) allows compilers to merge multiple instances of them.
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