Coding Standards: Use strict comparison in get_media_item().

Follow-up to [12081], [12351].

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

git-svn-id: https://develop.svn.wordpress.org/trunk@59751 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/media.php

@@ -1762,7 +1762,7 @@ function get_media_item( $attachment_id, $args = null ) {
 	if ( 'image' === $type && $calling_post_id
 		&& current_theme_supports( 'post-thumbnails', get_post_type( $calling_post_id ) )
 		&& post_type_supports( get_post_type( $calling_post_id ), 'thumbnail' )
-		&& get_post_thumbnail_id( $calling_post_id ) != $attachment_id
+		&& get_post_thumbnail_id( $calling_post_id ) !== $attachment_id
 	) {
 
 		$calling_post             = get_post( $calling_post_id );