GCC 4.6 warnings cleanup

mprotect.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "debug.h"
 #include "sandbox_impl.h"
 
 namespace playground {
 
 long Sandbox::sandbox_mprotect(const void *addr, size_t len, int prot) {
@@ skipping 23 matching lines @@
 
   // Cannot change permissions on any memory region that was part of the
   // original memory mappings.
   if (isRegionProtected((void *) mprotect_req.addr, mprotect_req.len)) {
     SecureMem::abandonSystemCall(*info, -EINVAL);
     return false;
   }
 
   // Changing permissions on memory regions that were newly mapped inside of
   // the sandbox is OK.
-  SecureMem::sendSystemCall(*info, SecureMem::SEND_UNLOCKED, mprotect_req.addr,
+  SecureMem::sendSystemCall(*info, SecureMem::SEND_UNLOCKED,
+                            const_cast<void*>(mprotect_req.addr),
                             mprotect_req.len, mprotect_req.prot);
   return true;
 }
 
 } // namespace