[SCTP] net/sctp/socket.c: make 3 variables static

This patch makes the following needlessly global variables static:
- sctp_memory_pressure
- sctp_memory_allocated
- sctp_sockets_allocated

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/socket.c

@@ -112,9 +112,9 @@ extern int sysctl_sctp_mem[3];
 extern int sysctl_sctp_rmem[3];
 extern int sysctl_sctp_wmem[3];
 
-int sctp_memory_pressure;
-atomic_t sctp_memory_allocated;
-atomic_t sctp_sockets_allocated;
+static int sctp_memory_pressure;
+static atomic_t sctp_memory_allocated;
+static atomic_t sctp_sockets_allocated;
 
 static void sctp_enter_memory_pressure(void)
 {