ISCSI fix broken send logic in iscsi_scsi_async_command

The send logic was completely broken for any cases except
ISCSI_INITIAL_R2T_NO and ISCSI_IMMEDIATE_DATA_YES.
The final flag was set wrong or no data was sent.

It was also broken if the data did not fit into the cmd_pdu as
the consecutive pdus did not have the scsi_cbdata set which
lead to a segfault in iscsi_get_user_out_buffer().

Unfortunately we need to include scsi-lowlevel.h again in iscsi-private.h.
This should be fixed asap by introduction of an iscsi_task struct
to avoid to store iscsi relevant data in the scsi_task.

Signed-off-by: Peter Lieven <pl@kamp.de>

Conflicts:

	lib/iscsi-command.c

Signed-off-by: Peter Lieven <pl@kamp.de>

include/iscsi-private.h

@@ -19,6 +19,8 @@
 
 #include <stdint.h>
 #include <time.h>
+/* We need this until we have an iscsi_task to get access to the iovector_out */
+#include "scsi-lowlevel.h"
 
 #if defined(WIN32)
 #include <basetsd.h>
@@ -219,6 +221,8 @@ struct iscsi_pdu {
 
 	int written;
 
+	struct scsi_task *task;     /* Reference to scsi_task to get iov with output data */
+
 	struct iscsi_data outdata; /* Header for PDU to send */
 	uint32_t out_offset;       /* Offset into data-out iovector */
 	uint32_t out_len;          /* Amount of data to sent */