batman-adv: Add missing include for in_interrupt()
The fix for receiving (internally generated) bla packets outside the interrupt context introduced the usage of in_interrupt(). But this functionality is only defined in linux/preempt.h which was not included with the same patch. Fixes: 279e89b2 ("batman-adv: bla: use netif_rx_ni when not in interrupt context") Signed-off-by: NSven Eckelmann <sven@narfation.org> Signed-off-by: NSimon Wunderlich <sw@simonwunderlich.de>
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