batman-adv: count_real_packets() in batman-adv assumes char is signed

count_real_packets() in batman-adv assumes char is signed, and returns -1
through it:

net/batman-adv/routing.c: In function 'receive_bat_packet':
net/batman-adv/routing.c:739: warning: comparison is always false due to limited range of data type

Use int instead.
Signed-off-by: David Howells <dhowells@redhat.com>
[sven@narfation.org: Rebase on top of current version]
Signed-off-by: Sven Eckelmann <sven@narfation.org>

net/batman-adv/bitarray.c

@@ -26,7 +26,7 @@
 
 /* returns true if the corresponding bit in the given seq_bits indicates true
  * and curr_seqno is within range of last_seqno */
-uint8_t get_bit_status(const unsigned long *seq_bits, uint32_t last_seqno,
+int get_bit_status(const unsigned long *seq_bits, uint32_t last_seqno,
 		   uint32_t curr_seqno)
 {
 	int32_t diff, word_offset, word_num;

net/batman-adv/bitarray.h

@@ -26,7 +26,7 @@
 
 /* returns true if the corresponding bit in the given seq_bits indicates true
  * and curr_seqno is within range of last_seqno */
-uint8_t get_bit_status(const unsigned long *seq_bits, uint32_t last_seqno,
+int get_bit_status(const unsigned long *seq_bits, uint32_t last_seqno,
 		   uint32_t curr_seqno);
 
 /* turn corresponding bit on, so we can remember that we got the packet */

net/batman-adv/routing.c

@@ -361,7 +361,7 @@ static void update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
 			const struct batman_packet *batman_packet,
 			struct hard_iface *if_incoming,
 			const unsigned char *tt_buff, int tt_buff_len,
-			char is_duplicate)
+			int is_duplicate)
 {
 	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 	struct neigh_node *router = NULL;
@@ -528,7 +528,7 @@ static int window_protected(struct bat_priv *bat_priv,
  *  -1 the packet is old and has been received while the seqno window
  *     was protected. Caller should drop it.
  */
-static char count_real_packets(const struct ethhdr *ethhdr,
+static int count_real_packets(const struct ethhdr *ethhdr,
 			       const struct batman_packet *batman_packet,
 			       const struct hard_iface *if_incoming)
 {
@@ -536,7 +536,7 @@ static char count_real_packets(const struct ethhdr *ethhdr,
 	struct orig_node *orig_node;
 	struct neigh_node *tmp_neigh_node;
 	struct hlist_node *node;
-	char is_duplicate = 0;
+	int is_duplicate = 0;
 	int32_t seq_diff;
 	int need_update = 0;
 	int set_mark, ret = -1;
@@ -605,7 +605,7 @@ void receive_bat_packet(const struct ethhdr *ethhdr,
 	char has_directlink_flag;
 	char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 	char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
-	char is_duplicate;
+	int is_duplicate;
 	uint32_t if_incoming_seqno;
 
 	/* Silently drop when the batman packet is actually not a