btrfs: use for-local variables that shadow function variables

We've started to use for-loop local variables and in a few places this
shadows a function variable. Convert a few cases reported by 'make W=2'.
If applicable also change the style to post-increment, that's the
preferred one.

Reviewed-by: Boris Burkov <[email protected]>
Reviewed-by: Anand Jain <[email protected]>
Reviewed-by: Naohiro Aota <[email protected]>
Signed-off-by: David Sterba <[email protected]>

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