fix le memory leak

src/Free/Arg.c

@@ -0,0 +1,10 @@
+#include "../../include/ground.h"
+
+void _GroundFreeArg(GroundArg* in) {
+    if (in->type == GroundArg_Value) {
+        Ground.Free.Value(&in->as.value);
+    } else {
+        // FIXME - double free for arg
+        // free(in->as.ref);
+    }
+}