Return empty instead of zero Buffer in modexp precompile on zero modlength

Author: holgerd77

lib/precompiled/05-modexp.js

@@ -110,7 +110,7 @@ module.exports = function (opts) {
   }
 
   if (mLen.isZero()) {
-    results.return = Buffer.from([0])
+    results.return = Buffer.alloc(0)
     results.exception = 1
     return results
   }