Networks and Sites: Remove unused variable in populate_networks().

This commit simply removes a `$network_exists` variable (introduced in r41384) that was never used.

Props mukesh27, Soean.

Fixes #64851.
Built from https://develop.svn.wordpress.org/trunk@61992


git-svn-id: http://core.svn.wordpress.org/trunk@61274 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/schema.php

@@ -1033,7 +1033,6 @@ function populate_network( $network_id = 1, $domain = '', $email = '', $site_nam
 	}
 
 	// Check for network collision.
-	$network_exists = false;
 	if ( is_multisite() ) {
 		if ( get_network( $network_id ) ) {
 			$errors->add( 'siteid_exists', __( 'The network already exists.' ) );

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-beta5-61991';
+$wp_version = '7.0-beta5-61992';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.