[symupload] Log details to stderr on failure

On success, symupload emits details such as the debug identifier. Emit a
very similar message to stderr on failure, as this information may also
be useful when diagnosing upload failures.

Bug: chromium:349736158
Change-Id: Ic3b5316283e4603dca815bd85a2fd51516fbcca8
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/5682842
Reviewed-by: Ivan Penkov <ivanpe@chromium.org>

src/tools/windows/symupload/symupload.cc

@@ -305,12 +305,12 @@ int wmain(int argc, wchar_t* argv[]) {
 
   _wunlink(symbol_file.c_str());
 
-  if (success) {
-    wprintf(L"Uploaded breakpad symbols for windows-%s/%s/%s (%s %s)\n",
-            pdb_info.cpu.c_str(), pdb_info.debug_file.c_str(),
-            pdb_info.debug_identifier.c_str(), code_file.c_str(),
-            file_version.c_str());
-  }
+  fwprintf(success ? stdout : stderr,
+           L"%S breakpad symbols for windows-%s/%s/%s (%s %s)\n",
+           success ? "Uploaded" : "Failed to upload",
+           pdb_info.cpu.c_str(), pdb_info.debug_file.c_str(),
+           pdb_info.debug_identifier.c_str(), code_file.c_str(),
+           file_version.c_str());
 
   return success ? 0 : 1;
 }