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Fix scan_build warnings in tiny_ssim.c

BUG=webm:1575

Change-Id: I3ad3af49d778f102e9152dcb1eb9d5c048756cdf

--- a/tools/tiny_ssim.c

+++ b/tools/tiny_ssim.c

@@ -53,6 +53,10 @@

   unsigned int row, col;

   uint64_t total_sse = 0;

   int diff;

+  if (orig == NULL || recon == NULL) {

+    assert(0);

+    return 0;

+  }

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

     for (col = 0; col < cols; col++) {

@@ -99,6 +103,9 @@

                            int h, int bit_depth) {

   char y4m_buf[4];

   size_t r1;

+  input->w = w;

+  input->h = h;

+  input->bit_depth = bit_depth;

   input->type = RAW_YUV;

   input->buf = NULL;

   input->file = strcmp(file_name, "-") ? fopen(file_name, "rb") : stdin;

@@ -187,6 +194,11 @@

                     uint32_t *sum_s, uint32_t *sum_r, uint32_t *sum_sq_s,

                     uint32_t *sum_sq_r, uint32_t *sum_sxr) {

   int i, j;

+  if (s == NULL || r == NULL || sum_s == NULL || sum_r == NULL ||

+      sum_sq_s == NULL || sum_sq_r || sum_sxr == NULL) {

+    assert(0);

+    return;

+  }

   for (i = 0; i < 8; i++, s += sp, r += rp) {

     for (j = 0; j < 8; j++) {

       *sum_s += s[j];