Resolve cppcheck issues.

Signed-off-by: John Hood <cgull@glup.org>

src/network/transportfragment.cc

@@ -148,7 +148,7 @@ Instruction FragmentAssembly::get_assembly( void )
   return ret;
 }
 
-bool Fragment::operator==( const Fragment &x )
+bool Fragment::operator==( const Fragment &x ) const
 {
   return ( id == x.id ) && ( fragment_num == x.fragment_num ) && ( final == x.final )
     && ( initialized == x.initialized ) && ( contents == x.contents );

src/network/transportfragment.h

@@ -73,7 +73,7 @@ namespace Network {
 
     string tostring( void );
 
-    bool operator==( const Fragment &x );
+    bool operator==( const Fragment &x ) const;
   };
 
   class FragmentAssembly