core (ble/util/sleep/.check-builtin-sleep): fix a bug that non-existing sleep is mistakenly detected
core (ble/util/sleep/.check-builtin-sleep): fix a bug that non-existing sleep is mistakenly detected

akinomyoga/ble.sh,akinomyoga/ble.sh,akinomyoga/ble.sh,akinomyoga/ble.sh