[SCSI] remove scsi_cmnd->state

We never look at it except for the old megaraid driver that abuses it
for sending internal commands.  That usage can be fixed easily because
those internal commands are single-threaded by a mutex and we can easily
use a completion there.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/megaraid.h

@@ -891,7 +891,7 @@ typedef struct {
 	Scsi_Cmnd		int_scmd;
 	struct semaphore	int_mtx;	/* To synchronize the internal
 						commands */
-	wait_queue_head_t	int_waitq;	/* wait queue for internal
+	struct completion	int_waitq;	/* wait queue for internal
 						 cmds */
 
 	int	has_cluster;	/* cluster support on this HBA */