[SCTP]: net/sctp/sysctl.c should #include <net/sctp/sctp.h>

Every file should #include the header files containing the prototypes of
it's global functions.

sctp.h contains the prototypes of sctp_sysctl_{,un}register().
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/sysctl.c

@@ -42,6 +42,7 @@
  */
 
 #include <net/sctp/structs.h>
+#include <net/sctp/sctp.h>
 #include <linux/sysctl.h>
 
 static ctl_handler sctp_sysctl_jiffies_ms;