elog: add a missing return statement

This just adds a missing "return -1" in case the fmap area is not
found.

BUG=chromium:239628
BRANCH=spring
TEST=tested on a machine without an eventlog

Change-Id: If64fee56886fbf6296d6829b53a3846e939fae1a
Reviewed-on: https://gerrit.chromium.org/gerrit/50371
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50707
1 file changed