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reuse mtrr slots with default memory type

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

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

@@ -295,7 +295,9 @@

 	for(i = 0; i < vcnt; i++){

 		mtrrget(&mtrr, i);

 		mok = mtrrdec(&mtrr, &mp, &msize, &mtype);

-		if(!mok || mp == base && msize == size){

+		if(slot == -1 && !mok || mtype == (def & Deftype))

+			slot = i;	/* good, but look further for exact match */

+		if(mok && mp == base && msize == size){

 			slot = i;

 			break;

 		}

-- 

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