Fix memory leak in media streaming.

Telegram/SourceFiles/media/streaming/media_streaming_file.cpp

@@ -309,6 +309,7 @@ void File::Context::readNextPacket() {
 		if (i->second.size() == kMaxQueuedPackets) {
 			processQueuedPackets(SleepPolicy::Allowed);
 		}
+		Assert(i->second.size() < kMaxQueuedPackets);
 	} else {
 		// Still trying to read by drain.
 		Assert(result.is<FFmpeg::AvErrorWrap>());

Telegram/SourceFiles/media/streaming/media_streaming_player.cpp

@@ -396,6 +396,8 @@ bool Player::fileProcessPackets(
 				videoReceivedTill(till);
 			});
 			_video->process(base::take(list));
+		} else {
+			list.clear(); // Free non-needed packets.
 		}
 	}
 	return fileReadMore();