[Toybox] [PATCH] fdisk cleanup

[ibid.ag at gmail.com]

I was poking around trying to create a raw image for some tests,
and discovered that I broke something in fdisk with the cleanup.
Specifically, the do {} while (!size) loop in read_input was resulting
in a lag in getting the message printed.

This patch fixes the issue. (Yes, I tested this time.)

Thanks,
Isaac Dunham
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