vf_lut: fix handling of odd dimensions

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_lut.c

@@ -327,9 +327,9 @@ static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
             inrow  = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane];
             outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane];
 
-            for (i = 0; i < h>>vsub; i ++) {
+            for (i = 0; i < (h + (1<<vsub) - 1)>>vsub; i ++) {
                 const uint8_t *tab = lut->lut[plane];
-                int w = inlink->w>>hsub;
+                int w = (inlink->w + (1<<hsub) - 1)>>hsub;
                 for (j = 0; j < w; j++)
                     outrow[j] = tab[inrow[j]];
                 inrow  += inpic ->linesize[plane];