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sequencer: lib'ify checkout_fast_forward()
Instead of dying there, let the caller high up in the callchain notice the error and handle it (by dying, still). The only callers of checkout_fast_forward(), cmd_merge(), pull_into_void(), cmd_pull() and sequencer's fast_forward_to(), already check the return value and handle it appropriately. With this step, we make it notice an error return from this function. So this is a safe conversion to make checkout_fast_forward() callable from new callers that want it not to die, without changing the external behaviour of anything existing. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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