avfilter/vf_thumbnail_cuda: Reindent after the previous commit

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

libavfilter/vf_thumbnail_cuda.c

@@ -304,7 +304,6 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 
 static av_cold void uninit(AVFilterContext *ctx)
 {
-    int i;
     ThumbnailCudaContext *s = ctx->priv;
 
     if (s->hwctx) {
@@ -322,7 +321,7 @@ static av_cold void uninit(AVFilterContext *ctx)
     }
 
     if (s->frames) {
-    for (i = 0; i < s->n_frames && s->frames[i].buf; i++)
+        for (int i = 0; i < s->n_frames && s->frames[i].buf; i++)
             av_frame_free(&s->frames[i].buf);
         av_freep(&s->frames);
     }