kernel: fix build with kernel 2.6.34-rc4

SVN-Revision: 20992

target/linux/generic-2.6/files/drivers/leds/ledtrig-morse.c

@@ -30,6 +30,7 @@
 #include <linux/timer.h>
 #include <linux/ctype.h>
 #include <linux/leds.h>
+#include <linux/slab.h>
 
 #include "leds.h"