Clean up logic around exit values. Make getasciilabel() return 0

for success. Fix a couple of bugs where errors in checklabel() got
lost.

Make Editor 'q' and 'x' commands exit with 0 (ok) rather than 1.
i.e. non-zero exit value now reserved for failure, not a decision
to leave the disklabel unchanged. This allows the install script
to use the exit value to catch failures to write a disklabel.

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