Code Modernization: Remove unnecessary reference sign from `get_comment()` definition.

This fixes a PHP 8 "argument must be passed by reference, value given" error when using `array_map( 'get_comment', ... )`.

Object variables in PHP 5+ contain a reference to the object, and it's the reference that's passed around.

Note: This reverts [48838], which is now redundant.

Follow-up to a similar change for `get_post()` in [21572].

See #50913.
Built from https://develop.svn.wordpress.org/trunk@48961


git-svn-id: http://core.svn.wordpress.org/trunk@48723 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-comment-query.php

@@ -481,8 +481,7 @@ class WP_Comment_Query {
 		$_comments = apply_filters_ref_array( 'the_comments', array( $_comments, &$this ) );
 
 		// Convert to WP_Comment instances.
-		array_walk( $_comments, 'get_comment' );
-		$comments = $_comments;
+		$comments = array_map( 'get_comment', $_comments );
 
 		if ( $this->query_vars['hierarchical'] ) {
 			$comments = $this->fill_descendants( $comments );

wp-includes/comment.php

@@ -192,7 +192,7 @@ function get_approved_comments( $post_id, $args = array() ) {
  *                                       respectively. Default OBJECT.
  * @return WP_Comment|array|null Depends on $output value.
  */
-function get_comment( &$comment = null, $output = OBJECT ) {
+function get_comment( $comment = null, $output = OBJECT ) {
 	if ( empty( $comment ) && isset( $GLOBALS['comment'] ) ) {
 		$comment = $GLOBALS['comment'];
 	}

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-48960';
+$wp_version = '5.6-alpha-48961';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.