desktop: Demote a bit of enumerate_storage_devices() diagnostics on W…

…indows

GetVolumeInformation() _will_ fail when looking at present removable
drives without any inserted media (optic drives, etc.). We shouldn't
make noise about that.

src/desktop/paths.cpp

@@ -78,8 +78,9 @@ void enumerate_storage_devices(std::vector<path_info>& res)
 			wchar_t label[label_bufsize] = { 0 };
 
 			if(GetVolumeInformation(drive, label, label_bufsize, NULL, NULL, NULL, NULL, 0) == 0) {
+				// Probably an empty removable drive, just ignore it and carry on.
 				const DWORD err = GetLastError();
-				ERR_DU << "enumerate_win32_drives(): GetVolumeInformation() failed (" << err << ")\n";
+				LOG_DU << "enumerate_win32_drives(): GetVolumeInformation() failed (" << err << ")\n";
 				continue;
 			}