avfilter/vf_signalstats: Reindent after the previous commit

Also use loop scope for iterators while just at it.

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

libavfilter/vf_signalstats.c

@@ -544,7 +544,6 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
     SignalstatsContext *s = ctx->priv;
     AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out = in;
-    int i, j;
     int  w = 0,  cw = 0, // in
         pw = 0, cpw = 0; // prev
     int fil;
@@ -614,8 +613,8 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
         const int lsz_sat = sat->linesize[0] / 2;
         const int lsz_hue = hue->linesize[0] / 2;
         // Calculate luma histogram and difference with previous frame or field.
-    for (j = 0; j < link->h; j++) {
-        for (i = 0; i < link->w; i++) {
+        for (int j = 0; j < link->h; j++) {
+            for (int i = 0; i < link->w; i++) {
                 const int yuv = AV_RN16(in->data[0] + w + i * 2);
 
                 masky |= yuv;
@@ -627,8 +626,8 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
         }
 
         // Calculate chroma histogram and difference with previous frame or field.
-    for (j = 0; j < s->chromah; j++) {
-        for (i = 0; i < s->chromaw; i++) {
+        for (int j = 0; j < s->chromah; j++) {
+            for (int i = 0; i < s->chromaw; i++) {
                 const int yuvu = AV_RN16(in->data[1] + cw + i * 2);
                 const int yuvv = AV_RN16(in->data[2] + cw + i * 2);
 
@@ -653,8 +652,8 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
         const int lsz_sat = sat->linesize[0];
         const int lsz_hue = hue->linesize[0];
         // Calculate luma histogram and difference with previous frame or field.
-    for (j = 0; j < link->h; j++) {
-        for (i = 0; i < link->w; i++) {
+        for (int j = 0; j < link->h; j++) {
+            for (int i = 0; i < link->w; i++) {
                 const int yuv = in->data[0][w + i];
 
                 masky |= yuv;
@@ -666,8 +665,8 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
         }
 
         // Calculate chroma histogram and difference with previous frame or field.
-    for (j = 0; j < s->chromah; j++) {
-        for (i = 0; i < s->chromaw; i++) {
+        for (int j = 0; j < s->chromah; j++) {
+            for (int i = 0; i < s->chromaw; i++) {
                 const int yuvu = in->data[1][cw+i];
                 const int yuvv = in->data[2][cw+i];
 
@@ -697,7 +696,7 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
             memset(s->jobs_rets, 0, s->nb_jobs * sizeof(*s->jobs_rets));
             ff_filter_execute(ctx, hbd ? filters_def[fil].process16 : filters_def[fil].process8,
                               &td, s->jobs_rets, s->nb_jobs);
-            for (i = 0; i < s->nb_jobs; i++)
+            for (int i = 0; i < s->nb_jobs; i++)
                 filtot[fil] += s->jobs_rets[i];
         }
     }