UBIFS: Fix trivial typos in comments

Change 'comress' to 'compress'
Change 'inteval' to 'interval'
Change 'disabe' to 'disable'
Change 'nenver' to 'never'

Signed-off-by: Yannick Guerrini <yguerrini@tomshardware.fr>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>