The `wp_update_comment_data` filter introduced in 4.7 allows comment data to be filtered before it is updated in the database.
The patch aims to handle `WP_Error` as the filter above return value in a similar manner as is done for `wp_new_comment()`.
Fixes#39732.
Props: enricosorcinelli, swissspidy, gkloveweb, jnylen0, jbpaul17, afercia, SergeyBiryukov, audrasjb, imath, davidbaumwald.
git-svn-id: https://develop.svn.wordpress.org/trunk@48154 602fd350-edb4-49c9-b593-d223f7449a82
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