Coding Standards: Use strict comparison in pingback().

Follow-up to [2983], [38852].

Props aristath, poena, afercia, SergeyBiryukov.
See #62279.

git-svn-id: https://develop.svn.wordpress.org/trunk@59827 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/comment.php

@@ -3124,7 +3124,7 @@ function pingback( $content, $post ) {
 	 */
 	foreach ( (array) $post_links_temp as $link_test ) {
 		// If we haven't pung it already and it isn't a link to itself.
-		if ( ! in_array( $link_test, $pung, true ) && ( url_to_postid( $link_test ) != $post->ID )
+		if ( ! in_array( $link_test, $pung, true ) && ( url_to_postid( $link_test ) !== $post->ID )
 			// Also, let's never ping local attachments.
 			&& ! is_local_attachment( $link_test )
 		) {