Code Quality: Make sure $comment_id is defined in wp-admin/comment.php.

This avoids a `variable.undefined` warning at PHPStan level 3.

Follow-up to [48958].

Props huzaifaalmesbah, westonruter, SergeyBiryukov.
See #64238.
Built from https://develop.svn.wordpress.org/trunk@61859


git-svn-id: http://core.svn.wordpress.org/trunk@61146 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/comment.php

@@ -48,7 +48,8 @@ if ( isset( $_REQUEST['c'] ) ) {
 		);
 	}
 } else {
-	$comment = null;
+	$comment_id = 0;
+	$comment    = null;
 }
 
 switch ( $action ) {

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-beta3-61858';
+$wp_version = '7.0-beta3-61859';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.