m1n1.proxy: Support negative arguments

Signed-off-by: Hector Martin <[email protected]>

Author: marcan

proxyclient/m1n1/proxy.py

@@ -671,6 +671,8 @@ def request(self, opcode, *args, **kwargs):
                 if (i < (len(args) - 1)) and args[i + 1] is None:
                     args[i + 1] = len(arg)
                 arg = p
+            if arg < 0:
+                arg &= (1 << 64) - 1
             args2.append(arg)
         try:
             return self._request(opcode, *args2, **kwargs)