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.cpp

@@ -518,7 +518,7 @@ void UdpListen::Close()
     m_sock = -1;
 }
 
-const char* UdpListen::Read( int& len, IpAddress& addr )
+const char* UdpListen::Read( size_t& len, IpAddress& addr )
 {
     static char buf[2048];
 
@@ -529,7 +529,7 @@ const char* UdpListen::Read( int& len, IpAddress& addr )
 
     sockaddr sa;
     socklen_t salen = sizeof( struct sockaddr );
-    len = recvfrom( m_sock, buf, 2048, 0, &sa, &salen );
+    len = (size_t)recvfrom( m_sock, buf, 2048, 0, &sa, &salen );
     addr.Set( sa );
 
     return buf;