distinguish close and EAGAIN

@@ -55,7 +55,7 @@ TR_socketRecv(void * _this, size_t size)
 
 	TR_RETCALL(_this, TR_Socket, recv, remote_data, size);
 
-    if (((TR_SizedData)remote_data)->size < 0) {
+    if (! remote_data) {
         switch (errno) {
 			case (EAGAIN|EWOULDBLOCK):
 				TR_delete(remote_data);
@@ -75,7 +75,7 @@ TR_socketRecv(void * _this, size_t size)
     } else if (((TR_SizedData)remote_data)->size == 0) {
         // this is a remote close...
 		TR_delete(remote_data);
-        return NULL;
+        return (void*)-1;
     }
 
     return remote_data;

@@ -96,7 +96,7 @@ tcpSocketRecv(TR_Socket this, size_t size)
 	received = recv(this->handle, buffer, size, this->flags);
 
 	if (-1 == received) {
-		rdata = TR_new(TR_RemoteData, NULL, received, this);
+		rdata = NULL;
 	} else {
 		rdata = TR_new(TR_RemoteData, buffer, received, this);
 	}