Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 21261)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -846,7 +846,7 @@
 
 			$attributes = "$class$style";
 
-			if ( 'cb' == $column_name ) {
+			if ( 'cb' === $column_name ) {
 				echo '<th scope="row" class="check-column">';
 				echo $this->column_cb( $item );
 				echo '</th>';