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devvga: remove unused copy of checkport() function

--- a/sys/src/9/pc/devvga.c

+++ b/sys/src/9/pc/devvga.c

@@ -142,20 +142,6 @@

 		}

 }

-static void

-checkport(int start, int end)

-{

-	/* standard vga regs are OK */

-	if(start >= 0x2b0 && end <= 0x2df+1)

-		return;

-	if(start >= 0x3c0 && end <= 0x3da+1)

-		return;

-

-	if(iounused(start, end))

-		return;

-	error(Eperm);

-}

-

 static long

 vgaread(Chan* c, void* a, long n, vlong off)

 {