The commit b1de0f01b011 ("batman-adv: Use netif_rx_any_context().") removed
the last user for a function declaration from linux/preempt.h. The include
should therefore be cleaned up.
Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>