Index: wp-admin/includes/class-wp-filesystem-ssh2.php
===================================================================
--- wp-admin/includes/class-wp-filesystem-ssh2.php	(revision 11787)
+++ wp-admin/includes/class-wp-filesystem-ssh2.php	(working copy)
@@ -178,7 +170,7 @@
 
 	function put_contents($file, $contents, $type = '' ) {
 		$file = ltrim($file, '/');
-		return file_put_contents('ssh2.sftp://' . $this->sftp_link . '/' . $file, $contents);
+		return false !== file_put_contents('ssh2.sftp://' . $this->sftp_link . '/' . $file, $contents);
 	}
 
 	function cwd() {