cmd/compile/internal/gc: simplify bool expression

Change-Id: Idcd79788e64947a927af662b6394ac7218e62ba8
Reviewed-on: https://go-review.googlesource.com/135836
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

src/cmd/compile/internal/gc/walk.go

@@ -1418,7 +1418,7 @@ opswitch:
 			// Maximum key and value size is 128 bytes, larger objects
 			// are stored with an indirection. So max bucket size is 2048+eps.
 			if !Isconst(hint, CTINT) ||
-				!(hint.Val().U.(*Mpint).CmpInt64(BUCKETSIZE) > 0) {
+				hint.Val().U.(*Mpint).CmpInt64(BUCKETSIZE) <= 0 {
 				// var bv bmap
 				bv := temp(bmap(t))