[Coverity] Fix possible leak.

base/platform_file_posix.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "base/platform_file.h"
 
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/stat.h>
 #include <unistd.h>
 
@@ skipping 70 matching lines @@
 
   int mode = S_IRUSR | S_IWUSR;
 #if defined(OS_CHROMEOS)
   mode |= S_IRGRP | S_IROTH;
 #endif
 
   int descriptor =
       HANDLE_EINTR(open(name.value().c_str(), open_flags, mode));
 
   if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
-    if (descriptor <= 0) {
+    if (descriptor < 0) {
       open_flags |= O_CREAT;
       if (flags & PLATFORM_FILE_EXCLUSIVE_READ ||
           flags & PLATFORM_FILE_EXCLUSIVE_WRITE) {
         open_flags |= O_EXCL;   // together with O_CREAT implies O_NOFOLLOW
       }
       descriptor = HANDLE_EINTR(
           open(name.value().c_str(), open_flags, mode));
-      if (created && descriptor > 0)
+      if (created && descriptor >= 0)
         *created = true;
     }
   }
 
-  if (created && (descriptor > 0) &&
+  if (created && (descriptor >= 0) &&
       (flags & (PLATFORM_FILE_CREATE_ALWAYS | PLATFORM_FILE_CREATE)))
     *created = true;
 
-  if ((descriptor > 0) && (flags & PLATFORM_FILE_DELETE_ON_CLOSE)) {
+  if ((descriptor >= 0) && (flags & PLATFORM_FILE_DELETE_ON_CLOSE)) {
     unlink(name.value().c_str());
   }
 
   if (error_code) {
     if (descriptor >= 0)
       *error_code = PLATFORM_FILE_OK;
     else {
       switch (errno) {
         case EACCES:
         case EISDIR:
@@ skipping 117 matching lines @@
   info->is_directory = S_ISDIR(file_info.st_mode);
   info->is_symbolic_link = S_ISLNK(file_info.st_mode);
   info->size = file_info.st_size;
   info->last_modified = base::Time::FromTimeT(file_info.st_mtime);
   info->last_accessed = base::Time::FromTimeT(file_info.st_atime);
   info->creation_time = base::Time::FromTimeT(file_info.st_ctime);
   return true;
 }
 
 }  // namespace base