dabbad: apply settings only if fetched correctly.
dabbad: apply settings only if fetched correctly.

The modified settings are always the current interface settings where
only the requested changes are modified.
If the interface settings could not be fetched the modifying them
afterwards would lead to unexpected behavior.

Signed-off-by: Emmanuel Roullit <e51ad7dcb99c77ecf30f537962c562ac80636eba@gmail.com>

eroullit/dabba,eroullit/dabba,eroullit/dabba,eroullit/dabba