[IPVS]: Fix compilation

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ipvs/ip_vs_est.c

@@ -18,6 +18,7 @@
 #include <linux/jiffies.h>
 #include <linux/slab.h>
 #include <linux/types.h>
+#include <linux/interrupt.h>
 
 #include <net/ip_vs.h>