ufs: switch ufs_evict_inode() to trimmed-down variant of ufs_truncate()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/ufs/inode.c
Simple merge

diff --cc fs/ufs/truncate.c
Simple merge

diff --cc fs/ufs/ufs.h
Simple merge