cmd/upspinfs: fix vet error by making maxBytes an integer
cmd/upspinfs: fix vet error by making maxBytes an integer

It's currently a float64, which triggers a vet error when printed with %d.
The code doesn't care.

Change-Id: Ib438d1ff9c2e4504e62e06dcd8e84b777a28d9e9
Reviewed-on: https://upspin-review.googlesource.com/18040
Reviewed-by: Eric Grosse <3706282e8b8557d7b3733fe2b8fbbcffca452208@gmail.com>
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>
Reviewed-by: David Presotto <d244755566b06d4c956c05eb7fe29c9fb345f41e@gmail.com>

upspin/upspin,upspin/upspin