Phonet: missing headers (sparse)

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/phonet/sysctl.c b/net/phonet/sysctl.c
index cea1c7d..740bf20 100644
--- a/net/phonet/sysctl.c
+++ b/net/phonet/sysctl.c
@@ -27,6 +27,10 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 
+#include <net/sock.h>
+#include <linux/phonet.h>
+#include <net/phonet/phonet.h>
+
 #define DYNAMIC_PORT_MIN	0x40
 #define DYNAMIC_PORT_MAX	0x7f