udf: Allocate name buffer in directory iterator on heap

Currently we allocate name buffer in directory iterators (struct
udf_fileident_iter) on stack. These structures are relatively large
(some 360 bytes on 64-bit architectures). For udf_rename() which needs
to keep three of these structures in parallel the stack usage becomes
rather heavy - 1536 bytes in total. Allocate the name buffer in the
iterator from heap to avoid excessive stack usage.

Link: https://lore.kernel.org/all/[email protected]
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Jan Kara <[email protected]>

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