batman-adv: Replace bitarray operations with bitmap

bitarray.c consists mostly of functionality that is already available as part
of the standard kernel API. batman-adv could use architecture optimized code
and reduce the binary size by switching to the standard functions.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 94fa1c2..0a20a19 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -65,7 +65,7 @@
 
 #define NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */
 
-#define NUM_WORDS (TQ_LOCAL_WINDOW_SIZE / WORD_BIT_SIZE)
+#define NUM_WORDS BITS_TO_LONGS(TQ_LOCAL_WINDOW_SIZE)
 
 #define LOG_BUF_LEN 8192	  /* has to be a power of 2 */