JNI NewString crashes when char length is zero

[marcprux]

The following code will crash in Avian:

jstring javaStr = (*jni)->NewString(jni, (jchar *)buffer, 0);

This patch will fix it:

diff --git a/VM/avian/jnienv.cpp b/VM/avian/jnienv.cpp
index 9e1d7e9..52da955 100644
--- a/VM/avian/jnienv.cpp
+++ b/VM/avian/jnienv.cpp
@@ -241,9 +241,8 @@ newString(Thread* t, uintptr_t* arguments)
   const jchar* chars = reinterpret_cast<const jchar*>(arguments[0]);
   jsize size = arguments[1];

-  object a = 0;
+  object a = makeCharArray(t, size);
   if (size) {
-    a = makeCharArray(t, size);
     memcpy(&charArrayBody(t, a, 0), chars, size * sizeof(jchar));
   }

[dicej]

Thanks; I've applied your patch:

ab5ec51