src: fix build on freebsd

src/base/platform/platform-freebsd.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for FreeBSD goes here. For the POSIX-compatible
 // parts, the implementation is in platform-posix.cc.
 
 #include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
@@ skipping 123 matching lines @@
     ssize_t bytes_read = read(fd, addr_buffer + 2, 8);
     if (bytes_read < 8) break;
     unsigned start = StringToLong(addr_buffer);
     bytes_read = read(fd, addr_buffer + 2, 1);
     if (bytes_read < 1) break;
     if (addr_buffer[2] != '-') break;
     bytes_read = read(fd, addr_buffer + 2, 8);
     if (bytes_read < 8) break;
     unsigned end = StringToLong(addr_buffer);
     char buffer[MAP_LENGTH];
-    int bytes_read = -1;
+    bytes_read = -1;
     do {
       bytes_read++;
       if (bytes_read >= MAP_LENGTH - 1)
         break;
       bytes_read = read(fd, buffer + bytes_read, 1);
       if (bytes_read < 1) break;
     } while (buffer[bytes_read] != '\n');
     buffer[bytes_read] = 0;
     // Ignore mappings that are not executable.
     if (buffer[3] != 'x') continue;
@@ skipping 143 matching lines @@
   return munmap(base, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   // TODO(alph): implement for the platform.
   return false;
 }
 
 } }  // namespace v8::base