target: remove the t_se_count field in struct se_cmd

Now that tasks are gone we are guaranteed to only get a single completion
per command, and thus don't need this counter.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Nicholas Bellinger <[e-mail]>

drivers/target/target_core_transport.c

···
 			goto out_busy;
 	}
 
-	if (atomic_read(&cmd->t_se_count)) {
-		if (!atomic_dec_and_test(&cmd->t_se_count))
-			goto out_busy;
-	}
-
 	if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 		cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 		target_remove_from_state_list(cmd);
···
 	}
 
 	atomic_inc(&cmd->t_fe_count);
-	atomic_inc(&cmd->t_se_count);
 
 	/*
 	 * For WRITEs, let the fabric know its buffer is ready.

include/target/target_core_base.h

···
 	unsigned char		__t_task_cdb[TCM_MAX_COMMAND_SIZE];
 	unsigned long long	t_task_lba;
 	atomic_t		t_fe_count;
-	atomic_t		t_se_count;
 	unsigned int		transport_state;
 #define CMD_T_ABORTED		(1 << 0)
 #define CMD_T_ACTIVE		(1 << 1)