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vp9_resize.c: assert vp9_highbd_resize_plane conditions

Clears static analysis warnings similar to the low bitdepth version:
commit c4367b9b51782969d3b37ead6694d19ef9bfb58c
Author: James Zern <jzern@google.com>
Date:   Wed Mar 18 14:34:30 2015 -0700

    vp9_resize_plane: quiet some static analysis warnings

Change-Id: I5501d0d6ad7c7720d746d53ec07078cb9051d0d7

--- a/vp9/encoder/vp9_resize.c

+++ b/vp9/encoder/vp9_resize.c

@@ -720,6 +720,10 @@

   uint16_t *arrbuf2 = (uint16_t *)malloc(sizeof(uint16_t) * height2);

   if (intbuf == NULL || tmpbuf == NULL || arrbuf == NULL || arrbuf2 == NULL)

     goto Error;

+  assert(width > 0);

+  assert(height > 0);

+  assert(width2 > 0);

+  assert(height2 > 0);

   for (i = 0; i < height; ++i) {

     highbd_resize_multistep(CONVERT_TO_SHORTPTR(input + in_stride * i), width,

                             intbuf + width2 * i, width2, tmpbuf, bd);