run-jjb.py: Don't decode output, as it's no longer captured

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: If7f4e3c8c97becdf8e55c82107c3e4eac5dc608f
diff --git a/ci/run-jjb.py b/ci/run-jjb.py
index b171e3b..0d6cf9a 100755
--- a/ci/run-jjb.py
+++ b/ci/run-jjb.py
@@ -119,7 +119,7 @@
         except (OSError, ValueError) as e:
             raise ValueError("%s" % e)
 
-        data = proc.stdout.decode()
+        #data = proc.stdout.decode()
         if proc.returncode != 0:
             raise ValueError("command has failed with code '%s'" % proc.returncode)