rbd: Use %zu for uint64_t instead of casting to unsigned long long
rbd: Use %zu for uint64_t instead of casting to unsigned long long

This was only used in debugging messages and not in any real code.

Ceph/RBD uses uint64_t for sizes internally and they can be printed
with %zu without any need for casting.

Signed-off-by: Wido den Hollander <be4891756a4fdc8c3c6609eb41e49789e971fe07@widodh.nl>

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