Remove unnecessary return when sorting array keys.

Since map keys must be unique, two equal arrays will never be compared, so this line of code will never be reached.

spew/common.go

@@ -368,7 +368,6 @@ func valueSortLess(a, b reflect.Value) bool {
 			}
 			return valueSortLess(av, bv)
 		}
-		return false
 	}
 	return a.String() < b.String()
 }