fat: factor out reusable code in vfat_rename() as helper functions

The vfat_rename() function is quite big and there are code blocks that can
be moved into helper functions.  This not only simplify the implementation
of that function but also allows these helpers to be reused.

For example, the helpers can be used by the handler of the RENAME_EXCHANGE
flag once this is implemented in a subsequent patch.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: OGAWA Hirofumi <[email protected]>
Signed-off-by: Javier Martinez Canillas <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Cc: Alexander Larsson <[email protected]>
Cc: Christian Kellner <[email protected]>
Cc: Chung-Chiang Cheng <[email protected]>
Cc: Colin Walters <[email protected]>
Cc: Lennart Poettering <[email protected]>
Cc: Muhammad Usama Anjum <[email protected]>
Cc: Peter Jones <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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