Revert "Fixes duplicated variable error"

This reverts commit 26da870.

src/xrep.cpp

@@ -218,7 +218,7 @@ int zmq::xrep_t::xsend (zmq_msg_t *msg_, int flags_)
     zmq_assert (rc == 0);
 
     //  Detach the message from the data buffer.
-    rc = zmq_msg_init (msg_);
+    int rc = zmq_msg_init (msg_);
     zmq_assert (rc == 0);
 
     return 0;