wprobe: add missing include statement (patch from #5325)

SVN-Revision: 16432

package/wprobe/src/kernel/linux/wprobe.h

@@ -22,6 +22,7 @@
 #include <linux/spinlock.h>
 #include <linux/module.h>
 #include <linux/list.h>
+#include <linux/timer.h>
 #include <net/genetlink.h>
 #endif