UBI: do not forget to free internal volumes
UBI: do not forget to free internal volumes

UBI forgets to free internal volumes when detaching MTD device.
Fix this.

Pointed-out-by: Adrian Hunter <07e5499f8ca7b9f9593b4a7656ea8c5a05a8f7f6@nokia.com>
Signed-off-by: Artem Bityutskiy <19b5733dcea388885746d36043d3568bba5b4df7@nokia.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs