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.

server/TracyFileRead.hpp

@@ -202,7 +202,7 @@ private:
         if( fread( &sz, 1, sizeof( sz ), m_file ) == sizeof( sz ) )
         {
             fread( m_lz4buf, 1, sz, m_file );
-            m_lastBlock = LZ4_decompress_safe_continue( m_stream, m_lz4buf, m_second, sz, BufSize );
+            m_lastBlock = (size_t)LZ4_decompress_safe_continue( m_stream, m_lz4buf, m_second, sz, BufSize );
         }
         else
         {
@@ -219,7 +219,7 @@ private:
     char* m_buf;
     char* m_second;
     size_t m_offset;
-    int m_lastBlock;
+    size_t m_lastBlock;
 
     std::atomic<bool> m_signalSwitch;
     std::atomic<bool> m_signalAvailable;