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deblock: annotate postproc parameters

Clears a clang static analyzer warning where 'cols' is assumed to be
less than 0, preventing the for loop from executing.

The assembly already requires that the size be 8 or 16 (U/V or Y plane)
and cols is a multiple of 8.

Change-Id: Ica4612690ead1638c94cfe56b306e87f8ce644f9

--- a/vpx_dsp/deblock.c

+++ b/vpx_dsp/deblock.c

@@ -7,6 +7,7 @@

  *  in the file PATENTS.  All contributing project authors may

  *  be found in the AUTHORS file in the root of the source tree.

  */

+#include <assert.h>

 #include <stdlib.h>

 #include "vpx/vpx_integer.h"

@@ -47,6 +48,9 @@

   int col;

   unsigned char v;

   unsigned char d[4];

+

+  assert(size >= 8);

+  assert(cols >= 8);

   for (row = 0; row < size; row++) {

     /* post_proc_down for one row */