avformat/nutenc: Fix indentation

Forgotten after 82beb46e65.
Also use loop-scope for iterators while at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/nutenc.c

@@ -1067,15 +1067,15 @@ static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
                 goto fail;
 
             if ((1ll<<60) % nut->sp_count == 0)
-            for (i=0; i<s->nb_streams; i++) {
+                for (unsigned i = 0; i < s->nb_streams; i++) {
-                int j;
                     StreamContext *nus = &nut->stream[i];
                     av_reallocp_array(&nus->keyframe_pts, 2*nut->sp_count, sizeof(*nus->keyframe_pts));
                     if (!nus->keyframe_pts) {
                         ret = AVERROR(ENOMEM);
                         goto fail;
                     }
-                for (j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)
+                    for (int j = nut->sp_count == 1 ? 0 : nut->sp_count;
+                         j < 2 * nut->sp_count; j++)
                         nus->keyframe_pts[j] = AV_NOPTS_VALUE;
             }
         }