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tiny_ssim: Fix an 'Uninitialized argument value' bug

found by clang-7.0.1 static analysis.
BUG=webm:1616

Change-Id: I2f7d1376e82e35227ad96d34417014ce5680ad96

--- a/tools/tiny_ssim.c

+++ b/tools/tiny_ssim.c

@@ -331,8 +331,7 @@

             "Usage: %s file1.{yuv|y4m} file2.{yuv|y4m}"

             "[WxH tl_skip={0,1,3} frame_stats_file bits]\n",

             argv[0]);

-    return_value = 1;

-    goto clean_up;

+    return 1;

   }

   if (argc > 3) {