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Cloning during a path component walk is only needed when the old fid
used for the walk operation is the root fid. Make that clear by
comparing the two fids rather than using an additional variable.

Link: https://lkml.kernel.org/r/20220527000003.355812-4-tyhicks@linux.microsoft.com

Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>