fix lack of null termination being written to the lun file
fix lack of null termination being written to the lun file

Change-Id: I51e2239c20c6b88a042c011b8807002491d759bc

InsomniaAOSP/platform_bootable_recovery,76Demented/bootable_recovery-,kylinmoddev/android_bootable_recovery,InsomniaAOSP/platform_bootable_recovery,76Demented/bootable_recovery-,InsomniaAOSP/platform_bootable_recovery,kylinmoddev/android_bootable_recovery,Plain-Andy/android_platform_bootable_recovery,randomblame/bootable_recovery,randomblame/bootable_recovery,randomblame/bootable_recovery,InsomniaAOSP/platform_bootable_recovery,randomblame/bootable_recovery,76Demented/bootable_recovery-,Plain-Andy/android_platform_bootable_recovery,kylinmoddev/android_bootable_recovery,DerTeufel/dualboot_recovery,Plain-Andy/android_platform_bootable_recovery,Plain-Andy/android_platform_bootable_recovery,76Demented/bootable_recovery-,DerTeufel/dualboot_recovery,DerTeufel/dualboot_recovery,76Demented/bootable_recovery-,DerTeufel/dualboot_recovery,DerTeufel/dualboot_recovery,InsomniaAOSP/platform_bootable_recovery,kylinmoddev/android_bootable_recovery,randomblame/bootable_recovery