video: fbdev: omap: Add prototype for hwa742_update_window_async()
The symbol hwa742_update_window_async() is exported, but there is no
prototype defined for it. That's why gcc complains:
Add the prototype, but I wonder if we couldn't drop exporting the symbol
instead. Since omapfb_update_window_async() is exported the same way,
are there any users outside of the tree?
Signed-off-by: Helge Deller <email@example.com>
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