Fix uninitialized variable error in presubmit_support
Fix uninitialized variable error in presubmit_support

Remove 'out' variable reference.  If subprocess.communicate()
throws an exception, out cannot contain data.

BUG=236073
TBR=cmp

Review URL: https://chromiumcodereview.appspot.com/14386022

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@196904 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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