Add missing \n after "Mounting /system." message.

Change-Id: I280a478526f033f5c0041d7e8a818fce6177d732
diff --git a/recovery.cpp b/recovery.cpp
index 75534e7..f7ae5e7 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -869,7 +869,7 @@
 
             case Device::MOUNT_SYSTEM:
                 if (ensure_path_mounted("/system") != -1) {
-                    ui->Print("Mounted /system.");
+                    ui->Print("Mounted /system.\n");
                 }
                 break;
         }