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pc64: fix ulongs for address of devarchs realmodemem file

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

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

@@ -1010,20 +1010,22 @@

 static long

 rmemrw(int isr, void *a, long n, vlong off)

 {

+	uintptr addr = off;

+

 	if(off < 0 || n < 0)

 		error("bad offset/count");

 	if(isr){

-		if(off >= MB)

+		if(addr >= MB)

 			return 0;

-		if(off+n >= MB)

-			n = MB - off;

-		memmove(a, KADDR((ulong)off), n);

+		if(addr+n >= MB)

+			n = MB - addr;

+		memmove(a, KADDR(addr), n);

 	}else{

-		/* allow vga framebuf's access */

-		if(off >= MB || off+n > MB ||

-		    (off < 0xA0000 || off+n > 0xB0000+0x10000))

+		/* allow vga framebuf's write access */

+		if(addr >= MB || addr+n > MB ||

+		    (addr < 0xA0000 || addr+n > 0xB0000+0x10000))

 			error("bad offset/count in write");

-		memmove(KADDR((ulong)off), a, n);

+		memmove(KADDR(addr), a, n);

 	}

 	return n;

 }