balloon: change wording of error message
balloon: change wording of error message

Signed-off-by: Gregory Brzeski <103febca8282301c88d7014bf9446121ad7f52c3@hyperone.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker