Coding Standards: Correct db_version check in wp-admin/admin.php.

Follow-up to [47785].

See #49239.

git-svn-id: https://develop.svn.wordpress.org/trunk@47787 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/admin.php

@@ -36,6 +36,7 @@
 nocache_headers();
 
 if ( get_option( 'db_upgraded' ) ) {
+
 	flush_rewrite_rules();
 	update_option( 'db_upgraded', false );
 
@@ -45,7 +46,9 @@
 	 * @since 2.8.0
 	 */
 	do_action( 'after_db_upgrade' );
-} elseif ( get_option( 'db_version' ) !== $wp_db_version && empty( $_POST ) ) {
+
+} elseif ( (int) get_option( 'db_version' ) !== $wp_db_version && empty( $_POST ) ) {
+
 	if ( ! is_multisite() ) {
 		wp_redirect( admin_url( 'upgrade.php?_wp_http_referer=' . urlencode( wp_unslash( $_SERVER['REQUEST_URI'] ) ) ) );
 		exit;