Can't read negative number of bytes.

This completely ignores error handling, which probably should be added.
The code behavior doesn't change, as the existing comparisons and
asserts already promoted the signed value to unsigned.

common/TracySocket.hpp

@@ -115,7 +115,7 @@ public:
     bool Listen( int port );
     void Close();
 
-    const char* Read( int& len, IpAddress& addr );
+    const char* Read( size_t& len, IpAddress& addr );
 
     UdpListen( const UdpListen& ) = delete;
     UdpListen( UdpListen&& ) = delete;