m68k/mac: Remove bogus "FIXME" comment

This code works fine. The comment is misleading so remove it.
Tested-by: NStan Johnson <userm57@yahoo.com>
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/mac/misc.c

@@ -329,10 +329,6 @@ static void via_shutdown(void)
 	}
 }
 
-/*
- * FIXME: not sure how this is supposed to work exactly...
- */
-
 static void oss_shutdown(void)
 {
 	oss->rom_ctrl = OSS_POWEROFF;