iscsi-target: Don't over-allocate sendtargets text resp buffer

No reason to allocate a buffer of size bigger than initiator
MaxRecvDataSegmentLength. Moreover, we need to respect initiator
MRDSL and not send a larger payload.
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/iscsi/iscsi_target.c

@@ -3397,7 +3397,7 @@ iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
 	unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
 	unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
 
-	buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
+	buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
 			 SENDTARGETS_BUF_LIMIT);
 
 	payload = kzalloc(buffer_len, GFP_KERNEL);