driver/bch: fix static analysis error
driver/bch: fix static analysis error

fix unlock routine

Change-Id: I822a85ef26f5125297de1483a17e2b758a121c40
Signed-off-by: Bongryul Lee <40e5879ba2a710c5c582426d4fb9229bced4a8b1@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT