[TIPC]: Use correct bitmask when setting version

This patch ensures that the 3-bit version field of the TIPC
message header is masked correctly when written into a message.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 5cf76a4..88a2ee0 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -85,7 +85,7 @@
 
 static inline void msg_set_version(struct tipc_msg *m)
 {
-	msg_set_bits(m, 0, 29, 0xf, TIPC_VERSION);
+	msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
 }
 
 static inline u32 msg_user(struct tipc_msg *m)