Fixed coverity defects regarding pass-by-value

sandbox/linux/seccomp-bpf/sandbox_bpf.h

 // Copyright (c) 2012 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.
 
 #ifndef SANDBOX_BPF_H__
 #define SANDBOX_BPF_H__
 
 #include <endian.h>
 #include <errno.h>
 #include <fcntl.h>
@@ skipping 304 matching lines @@
     }
   }
 
   // Get a file descriptor pointing to "/proc", if currently available.
   static int getProcFd() { return proc_fd_; }
 
  private:
   friend class Util;
   friend class Verifier;
   struct Range {
-    Range(uint32_t f, uint32_t t, ErrorCode e) :
+    Range(uint32_t f, uint32_t t, const ErrorCode& e) :
       from(f),
       to(t),
       err(e) {
     }
     uint32_t  from, to;
     ErrorCode err;
   };
   struct FixUp {
     FixUp(unsigned int a, bool j) :
       jt(j), addr(a) { }
@@ skipping 35 matching lines @@
   static Traps         *traps_;
   static TrapIds       trapIds_;
   static ErrorCode     *trapArray_;
   static size_t        trapArraySize_;
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sandbox);
 };
 
 }  // namespace
 
 #endif  // SANDBOX_BPF_H__