obs-ffmpeg: Fix warning about useless llabs call

plugins/obs-ffmpeg/obs-ffmpeg-video-encoders.c

@@ -216,7 +216,7 @@ bool ffmpeg_video_encode(struct ffmpeg_video_encoder *enc,
 {
 	AVPacket av_pkt = {0};
 	bool timeout = false;
-	int64_t cur_ts = (int64_t)os_gettime_ns();
+	const int64_t cur_ts = (int64_t)os_gettime_ns();
 	int got_packet;
 	int ret;
 
@@ -256,17 +256,17 @@ bool ffmpeg_video_encode(struct ffmpeg_video_encoder *enc,
 		packet->keyframe = !!(av_pkt.flags & AV_PKT_FLAG_KEY);
 		*received_packet = true;
 
-		uint64_t recv_ts_nsec =
-			util_mul_div64((uint64_t)av_pkt.pts,
-				       (uint64_t)SEC_TO_NSEC,
-				       (uint64_t)enc->context->time_base.den) +
+		const int64_t recv_ts_nsec =
+			(int64_t)util_mul_div64(
+				(uint64_t)av_pkt.pts, (uint64_t)SEC_TO_NSEC,
+				(uint64_t)enc->context->time_base.den) +
 			enc->start_ts;
 
 #if 0
 		debug("cur: %lld, packet: %lld, diff: %lld", cur_ts,
 		      recv_ts_nsec, cur_ts - recv_ts_nsec);
 #endif
-		if (llabs(cur_ts - recv_ts_nsec) > TIMEOUT_MAX_NSEC) {
+		if ((cur_ts - recv_ts_nsec) > TIMEOUT_MAX_NSEC) {
 			char timeout_str[16];
 			snprintf(timeout_str, sizeof(timeout_str), "%d",
 				 TIMEOUT_MAX_SEC);