[SCSI] hpsa: remove unused kthread.h header

Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

drivers/scsi/hpsa.c

@@ -47,7 +47,6 @@
 #include <linux/string.h>
 #include <linux/bitmap.h>
 #include <linux/atomic.h>
-#include <linux/kthread.h>
 #include <linux/jiffies.h>
 #include <asm/div64.h>
 #include "hpsa_cmd.h"