New commit message.
revert: simplify insn parsing logic
Our instruction sheet parser first looks for a valid action by
checking that the buffer starts with either "pick" or "revert". Then,
it looks for either spaces or tabs before looking for the object name,
erroring out if it doesn't find any. Simplify this logic without
making any functional changes by looking for ("pick " or "pick\t") or
("revert " or "revert\t") in the first place.
-- Ram