printf was missing a parameter BUG=none TEST=emerge-link chromeos-seabios, observer no more warnings produced by serial.c BRANCH=link Signed-off-by: Stefan Reinauer <reinauer@chromium.org> Change-Id: Ic7a76bd59232a115fcadaa96318b38bc67c4f6bf Reviewed-on: https://gerrit.chromium.org/gerrit/35285 Commit-Ready: Stefan Reinauer <reinauer@chromium.org> Tested-by: Stefan Reinauer <reinauer@chromium.org> Reviewed-by: Duncan Laurie <dlaurie@chromium.org> 
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