Suppress pylint misbehaviour, rather than pointless assign.
Suppress pylint misbehaviour, rather than pointless assign.

BUG=None
TEST=pylint --rcfile chromite/pylintrc chromite/lib/locking.py

Change-Id: I3b3cf66261083754a20d26d68ba1260130326553
Reviewed-on: https://gerrit.chromium.org/gerrit/16248
Commit-Ready: Brian Harring <fdc2d0a2e2340b623587cee5ea8dff425d1eb1f3@chromium.org>
Tested-by: Brian Harring <fdc2d0a2e2340b623587cee5ea8dff425d1eb1f3@chromium.org>
Reviewed-by: Matt Tennant <46e612415b446ccde19638e4035892001c237942@chromium.org>

zhang0137/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,coreos/chromite,zhang0137/chromite,coreos/chromite,chadversary/chromiumos.chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,zhang0137/chromite