staging/lustre/llite: Fix wrong identing in ll_setxattr_common

smatch has highlighted wrong indenting that results from
commit 7fc1f831 ("staging/lustre/llite: extended attribute cache")
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>