Solve clang warning
```
Non-void function does not return a value in all control pathsclang(-Wreturn-type)
```
by returning `nullptr` from `RTCVideoDecoderFactory::CreateVideoDecoder`
when no decoder was selected for creation
Bug: https://cam.sprc.samsung.pl/browse/VDWASM-1214
Change-Id: Icfd4ea6508ac6c035cd437d87040d110928437eb
Signed-off-by: Michal Jurkiewicz <m.jurkiewicz@samsung.com>
const bool game_mode = command_line.HasSwitch(switches::kEnableGameMode);
if (game_mode)
return RTCVideoDecoderEflLowLatency::Create(manager_, format);
+ return nullptr;
#else // defined(OS_TIZEN_TV_PRODUCT) && defined(TIZEN_VIDEO_HOLE) &&
// defined(ENABLE_ESPLUSPLAYER)
auto decoder = RTCVideoDecoderAdapter::Create(gpu_factories_, format);