Revisions: Remove an unnecessary call to _doing_it_wrong() and corresponding new text string from the implementation of the new wp_save_post_revision_revisions_before_deletion filter.

While the guard condition was technically correct, it's not practical or necessary to provide this protection for every use of every filter, and it adds unnecessary burden to translators to provide translations for strings that will likely not be seen.

Follow up to [55254].

Fixes #57320


git-svn-id: https://develop.svn.wordpress.org/trunk@55406 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/revision.php

@@ -205,30 +205,15 @@ function wp_save_post_revision( $post_id ) {
 	 *
 	 * @since 6.2.0
 	 *
-	 * @param WP_Post[]|int[] $revisions Array of revision objects or IDs,
-	 *                                   or an empty array if none.
-	 * @param int             $post_id   The ID of the post to save as a revision.
+	 * @param WP_Post[] $revisions Array of revisions, or an empty array if none.
+	 * @param int       $post_id   The ID of the post to save as a revision.
 	 */
-	$filtered_revisions = apply_filters(
+	$revisions = apply_filters(
 		'wp_save_post_revision_revisions_before_deletion',
 		$revisions,
 		$post_id
 	);
 
-	if ( is_array( $filtered_revisions ) ) {
-		$revisions = $filtered_revisions;
-	} else {
-		_doing_it_wrong(
-			__FUNCTION__,
-			sprintf(
-				/* translators: %s: The filter name. */
-				__( 'The "%s" filter should return an array.' ),
-				'wp_save_post_revision_revisions_before_deletion'
-			),
-			'6.2.0'
-		);
-	}
-
 	$delete = count( $revisions ) - $revisions_to_keep;
 
 	if ( $delete < 1 ) {