Fix a typo error.

This error is introduced by baafb8f92e29bf6da68e56251863707b683c67af.

BUG=

Review URL: https://codereview.chromium.org/791543003

Cr-Commit-Position: refs/heads/master@{#25724}
[turbofan] Fix control reducer bug with NTLs.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/789773002

Cr-Commit-Position: refs/heads/master@{#25725}