libfs: Remove unnecessary ‘0’ values from ret

ret is assigned first, so it does not need to initialize the assignment.

Signed-off-by: Li zeming <zeming@nfschina.com>
Link: https://lore.kernel.org/r/20240220062030.114203-1-zeming@nfschina.com


Signed-off-by: Christian Brauner <brauner@kernel.org>