ffplay: no need to detect isnan(frame_timer)

ijkmediaplayer/jni/ijkplayer/ff_ffplay.c

@@ -407,9 +407,7 @@ static void stream_toggle_pause_l(FFPlayer *ffp, int pause_on)
 {
     VideoState *is = ffp->is;
     if (is->paused && !pause_on) {
-        double frame_timer_diff = is->vidclk.pts_drift - is->vidclk.pts;
-        if (!isnan(frame_timer_diff))
-            is->frame_timer += av_gettime() / 1000000.0 + frame_timer_diff;
+        is->frame_timer += av_gettime() / 1000000.0 + is->vidclk.pts_drift - is->vidclk.pts;
 
 #ifdef FFP_MERGE
         if (is->read_pause_return != AVERROR(ENOSYS)) {