target: Fix unsupported WRITE_SAME sense payload

This patch fixes a bug in target-core where unsupported WRITE_SAME ops
from a target_check_write_same_discard() failure was incorrectly
returning CHECK_CONDITION w/ TCM_INVALID_CDB_FIELD sense data.
This was causing some clients to not properly fall back, so go ahead
and use the correct TCM_UNSUPPORTED_SCSI_OPCODE sense for this case.

Reported-by: Martin Svec <martin.svec@zoner.cz>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_transport.c

@@ -2697,7 +2697,7 @@ static int transport_generic_cmd_sequencer(
 			cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
 
 			if (target_check_write_same_discard(&cdb[10], dev) < 0)
-				goto out_invalid_cdb_field;
+				goto out_unsupported_cdb;
 			if (!passthrough)
 				cmd->execute_task = target_emulate_write_same;
 			break;
@@ -2980,7 +2980,7 @@ static int transport_generic_cmd_sequencer(
 		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
 
 		if (target_check_write_same_discard(&cdb[1], dev) < 0)
-			goto out_invalid_cdb_field;
+			goto out_unsupported_cdb;
 		if (!passthrough)
 			cmd->execute_task = target_emulate_write_same;
 		break;
@@ -3003,7 +3003,7 @@ static int transport_generic_cmd_sequencer(
 		 * of byte 1 bit 3 UNMAP instead of original reserved field
 		 */
 		if (target_check_write_same_discard(&cdb[1], dev) < 0)
-			goto out_invalid_cdb_field;
+			goto out_unsupported_cdb;
 		if (!passthrough)
 			cmd->execute_task = target_emulate_write_same;
 		break;