help.c: wrap wait-only poll() invocation in sleep_millisec()
We want to use the new function elsewhere in a moment. Signed-off-by: NJohannes Sixt <j6t@kdbg.org> Reviewed-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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