Ensure there is no two same storages showing on the computer.

[Preconditions]
1. Insert a SIM card into phone and set the SIM lock as "on"
2. Select MTP mode
3. Power off the mobile

[Procedures]
1.Connected the phone and PC with usb cable
2.Power on the phone->Input PIN code of SIM lock to enter the IDLE view
3.Check the storage list on PC

[Reproduce]
Rarely

Change-Id: I8efc3f812b669f2d4e2c3be89e3f97b5cc895628