ubifs: remove unnecessary assignment

Assigning a value of a variable to itself is not useful. This
fixes a warning shown when using clang:
  warning: explicitly assigning value of variable of type 'int' to itself [-Wself-assign]

Change-Id: I24e6833421eee33734eb24aa80cb6c429e489f2e
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Richard Weinberger <richard@nod.at>
Git-commit: ae4c8081eb77bc82ac5ac8a7d55abea6f98e0209
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git


Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>