Silence REGION_INIT() warning.
Evaluating the address of a BoxRec as a boolean gives this warning: i830_driver.c:2317: warning: the address of 'ScreenBox' will always evaluate as 'true' which is pretty annoying. This patch compares the address to NULL to avoid the pointer->bool conversion and gets rid of the warning. Seems like a lame hack, but the warning is worse.
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