rust: str: move SAFETY comment in front of unsafe block

SAFETY comments should immediately precede the unsafe block they
justify. Move assignment to `bar` past comment as it is safe.

Signed-off-by: Valentin Obst <[email protected]>
Reviewed-by: Trevor Gross <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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