Staging: batman-adv: Allow to build it inside the kernel

We must use the user supplied information about how the code should be
compiled instead of always trying to build it as module.

Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/Makefile

@@ -18,5 +18,5 @@
 # 02110-1301, USA
 #
 
-obj-m += batman-adv.o
+obj-$(CONFIG_BATMAN_ADV) += batman-adv.o
 batman-adv-objs := main.o bat_debugfs.o bat_sysfs.o send.o routing.o soft-interface.o icmp_socket.o translation-table.o bitarray.o hash.o ring_buffer.o vis.o hard-interface.o aggregation.o originator.o