udf: Avoid accessing uninitialized data on failed inode read

When we fail to read inode, some data accessed in udf_evict_inode() may
be uninitialized. Move the accesses to !is_bad_inode() branch.

Reported-by:  <syzbot+91f02b28f9bb5f5f1341@syzkaller.appspotmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>