UBI: Fastmap: Remove else after return.

checkpatch.pl complains:
WARNING: else is not generally useful after a break or return

Signed-off-by: Richard Weinberger <richard@nod.at>
Git-commit: e1bc37ceafc04dff20a8cdc88ed250941ec2ea92
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Nikhilesh Reddy <reddyn@codeaurora.org>