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arm64: looprestoration: Pass a correct height parameter to sgr_box3_h_neon for the top slice

As the neon function processes two rows at a time, this has passed
unnoticed.

--- a/src/arm/looprestoration_init_tmpl.c

+++ b/src/arm/looprestoration_init_tmpl.c

@@ -122,7 +122,7 @@

     dav1d_sgr_box3_h_neon(sumsq, sum, left, src, stride, w, h, edges);

     if (edges & LR_HAVE_TOP)

         dav1d_sgr_box3_h_neon(&sumsq[-2 * (384 + 16)], &sum[-2 * (384 + 16)],

-                              NULL, lpf, lpf_stride, w, 1, edges);

+                              NULL, lpf, lpf_stride, w, 2, edges);

     if (edges & LR_HAVE_BOTTOM)

         dav1d_sgr_box3_h_neon(&sumsq[h * (384 + 16)], &sum[h * (384 + 16)],