golang.org/x/sys: fix typo in test

Change-Id: I5709137db7308934e627d866da1cc8aa5abca7db
Reviewed-on: https://go-review.googlesource.com/47310Reviewed-by: Rob Pike <r@golang.org>

windows/registry/registry_test.go

@@ -336,7 +336,7 @@ func testGetValue(t *testing.T, k registry.Key, test ValueTest, size int) {
 	// read data with short buffer
 	gotsize, gottype, err = k.GetValue(test.Name, make([]byte, size-1))
 	if err == nil {
-		t.Errorf("GetValue(%s, [%d]byte) should fail, but suceeded", test.Name, size-1)
+		t.Errorf("GetValue(%s, [%d]byte) should fail, but succeeded", test.Name, size-1)
 		return
 	}
 	if err != registry.ErrShortBuffer {