lavfi: use ceil right shift for chroma width/height.

This should fix several issues with odd dimensions inputs.

lut, vflip, pad and crop video filters also need to be checked for such
issues. It's possible sws is also affected.

libavfilter/vf_transpose.c

@@ -163,8 +163,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
         int pixstep = trans->pixsteps[plane];
         int inh  = in->height  >> vsub;
-        int outw = out->width  >> hsub;
-        int outh = out->height >> vsub;
+        int outw = FF_CEIL_RSHIFT(out->width,  hsub);
+        int outh = FF_CEIL_RSHIFT(out->height, vsub);
         uint8_t *dst, *src;
         int dstlinesize, srclinesize;
         int x, y;