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Fix scan_build warnings in tiny_ssim.c

BUG=webm:1575

Change-Id: I022794054b494512903d912bdbf3e85461f31665

--- a/tools/tiny_ssim.c

+++ b/tools/tiny_ssim.c

@@ -34,6 +34,10 @@

   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++) {

@@ -195,7 +199,7 @@

                     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) {

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

     assert(0);

     return;

   }

@@ -214,6 +218,11 @@

                            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 == NULL || 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];