target: Remove the unused flag SCF_ACK_KREF

The flag SCF_ACK_KREF is only set but never tested. Hence remove
this flag.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_transport.c

@@ -2479,10 +2479,8 @@ int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
 	 * fabric acknowledgement that requires two target_put_sess_cmd()
 	 * invocations before se_cmd descriptor release.
 	 */
-	if (ack_kref) {
+	if (ack_kref)
 		kref_get(&se_cmd->cmd_kref);
-		se_cmd->se_cmd_flags |= SCF_ACK_KREF;
-	}
 
 	spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
 	if (se_sess->sess_tearing_down) {

include/target/target_core_base.h

@@ -165,7 +165,6 @@ enum se_cmd_flags_table {
 	SCF_SEND_DELAYED_TAS		= 0x00004000,
 	SCF_ALUA_NON_OPTIMIZED		= 0x00008000,
 	SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC = 0x00020000,
-	SCF_ACK_KREF			= 0x00040000,
 	SCF_COMPARE_AND_WRITE		= 0x00080000,
 	SCF_COMPARE_AND_WRITE_POST	= 0x00100000,
 };