nimble/host: Set length correctly in perdioic_set_adv_data #1539
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This change sets length field only if data is non NULL, else sets length to zero.
Core 5.4, Vol 4, Part E, section 7.8.62 states
"If Operation is not 0x03 or 0x04 and Advertising_Data_Length is zero, then the Controller shall return the error code Invalid HCI Command Parameters (0x12).."
Current code sets length to size of data. However, to validate above, need to send 0 length . So calculate length only if data is present.