Revert "avfilter/vf_noise: dont corrupt the picture outside width x height"

This reverts commit 51dab60c.

this fixed nothing, and was just the result of assuming that the
variable named linesize was the linesize. Its not, its the width
in bytes which was already correct.

Found-by: durandal_1707

libavfilter/vf_noise.c

@@ -57,7 +57,6 @@ typedef struct {
     const AVClass *class;
     int nb_planes;
     int linesize[4];
-    int bytewidth[4];
     int height[4];
     FilterParams all;
     FilterParams param[4];
@@ -197,9 +196,6 @@ static int config_input(AVFilterLink *inlink)
     n->height[1] = n->height[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
     n->height[0] = n->height[3] = inlink->h;
 
-    n->bytewidth [1] = n->bytewidth [2] = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w) * ((desc->comp[0].depth_minus1 + 1) / 8);
-    n->bytewidth [0] = n->bytewidth [3] = inlink->w * ((desc->comp[0].depth_minus1 + 1) / 8);
-
     return 0;
 }
 
@@ -381,7 +377,7 @@ static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
         noise(td->out->data[plane] + start * td->out->linesize[plane],
               td->in->data[plane]  + start * td->in->linesize[plane],
               td->out->linesize[plane], td->in->linesize[plane],
-              s->bytewidth[plane], start, end, s, plane);
+              s->linesize[plane], start, end, s, plane);
     }
     return 0;
 }