sd: fix error in sd_ble_gap_scan_start after stop scan with nrf528xx #404
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"C.sd_ble_gap_scan_stop()" must not followed by "C.sd_ble_gap_scan_start(nil, &scanReportBufferInfo)", otherwise the latter returns the error "invalid state, operation disallowed in this state"
This fixes #403 .
Additionally:
Postponing the termination of the for loop until after the callback speeds up the loop and should be possible without risk.