Use return value from fwrite in log.cc to please compilers.

BUG=453
Review URL: http://codereview.chromium.org/4002005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5694 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/log.cc

@@ -1378,8 +1378,10 @@ void Logger::LogCodeInfo() {
 void Logger::LowLevelCodeCreateEvent(Code* code, LogMessageBuilder* msg) {
   if (!FLAG_ll_prof || Log::output_code_handle_ == NULL) return;
   int pos = static_cast<int>(ftell(Log::output_code_handle_));
-  fwrite(code->instruction_start(), 1, code->instruction_size(),
+  int rv = fwrite(code->instruction_start(), 1, code->instruction_size(),
                   Log::output_code_handle_);
+  ASSERT(static_cast<size_t>(code->instruction_size()) == rv);
+  USE(rv);
   msg->Append(",%d", pos);
 }
 

src/platform-macos.cc

@@ -206,7 +206,11 @@ OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
     void* initial) {
   FILE* file = fopen(name, "w+");
   if (file == NULL) return NULL;
-  fwrite(initial, size, 1, file);
+  int result = fwrite(initial, size, 1, file);
+  if (result < 1) {
+    fclose(file);
+    return NULL;
+  }
   void* memory =
       mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0);
   return new PosixMemoryMappedFile(file, memory, size);