udf: cache struct udf_inode_info

cache UDF_I(struct inode *) return values when there are
at least 2 uses in one function

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc fs/udf/balloc.c
Simple merge

diff --cc fs/udf/dir.c
Simple merge

diff --cc fs/udf/directory.c
Simple merge

diff --cc fs/udf/file.c
Simple merge

diff --cc fs/udf/ialloc.c
Simple merge

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

diff --cc fs/udf/misc.c
Simple merge

diff --cc fs/udf/namei.c
Simple merge

diff --cc fs/udf/partition.c
Simple merge

diff --cc fs/udf/symlink.c
Simple merge

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