ESR: make vert chroma resampling always centered

av1/common/resize.c

diff --git a/av1/common/resize.c b/av1/common/resize.c
index c8e72cd..0b2ab30 100644
--- a/av1/common/resize.c
+++ b/av1/common/resize.c
@@ -1006,6 +1006,8 @@
                                    int subx, int suby, int bd, int denom,
                                    int num, int lanczos_a_hor,
                                    int lanczos_a_ver) {
+  (void)suby;
+
   int coeff_prec_bits = 14;
   int extra_prec_bits = 2;
   WIN_TYPE win = WIN_LANCZOS;
@@ -1014,7 +1016,7 @@
   int horz_a = lanczos_a_hor;
   int vert_a = lanczos_a_ver;
   double horz_x0 = subx ? (double)('d') : (double)('c');
-  double vert_x0 = suby ? (double)('d') : (double)('c');
+  double vert_x0 = (double)('c');
 
   RationalResampleFilter horz_rf;
   RationalResampleFilter vert_rf;
@@ -1024,7 +1026,7 @@
     fprintf(stderr, "Cannot generate filter, exiting!\n");
     exit(1);
   }
-  if (!get_resample_filter(num, denom, vert_a, vert_x0, ext, win, suby,
+  if (!get_resample_filter(num, denom, vert_a, vert_x0, ext, win, 0,
                            coeff_prec_bits, &vert_rf)) {
     fprintf(stderr, "Cannot generate filter, exiting!\n");
     exit(1);