message: reactor.filesystem: address compiler warnings
  Check return values.
diff: @@ -100,7 +100,8 @@ namespace elle
  //
  size_t cchUTF16Max = 10000 - 1;
  size_t cchUTF16;
  - HRESULT hr = ::StringCchLengthW( pszTextUTF16, cchUTF16Max, &cchUTF16 );
  + if (FAILED(::StringCchLengthW( pszTextUTF16, cchUTF16Max, &cchUTF16)))
  + ELLE_DEBUG("StringCchLengthW failed");
  // Consider also terminating
  ++cchUTF16;
  //
  @@ -140,7 +141,7 @@ namespace elle
  //
  // Do the conversion from UTF-16 to UTF-8
  //
  - int result = ::WideCharToMultiByte(
  + if (::WideCharToMultiByte(
  CP_UTF8, // convert to UTF-8
  dwConversionFlags, // specify conversion behavior
  pszTextUTF16, // source UTF-16 string
  @@ -149,7 +150,8 @@ namespace elle
  pszUTF8, // destination buffer
  cbUTF8, // destination buffer size, in bytes
  NULL, NULL // unused
  - );
  + ))
  + ELLE_LOG("WideCharToMultiByte failed: %s", GetLastError())
  // Return resulting UTF-8 string
  strUTF8 = strUTF8.substr(0, strUTF8.size()-1);
  @@ -873,7 +875,7 @@ namespace elle
  __attribute__((__stdcall__))
  NTSTATUS Unmount(PDOKAN_FILE_INFO context)
  {
  - ELLE_LOG("Filesystem umonut notification received.");
  + ELLE_LOG("Filesystem umount notification received.");
  return STATUS_SUCCESS;
  }
  