nvmet-tcp: remove superflous check on request sgl

Now that sgl_free is null safe, drop the superflous check.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>

drivers/nvme/target/tcp.c

@@ -348,7 +348,6 @@ static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
 
 	return 0;
 err:
-	if (cmd->req.sg_cnt)
 	sgl_free(cmd->req.sg);
 	return NVME_SC_INTERNAL;
 }
@@ -554,7 +553,6 @@ static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd)
 
 	if (queue->nvme_sq.sqhd_disabled) {
 		kfree(cmd->iov);
-		if (cmd->req.sg_cnt)
 		sgl_free(cmd->req.sg);
 	}
 
@@ -586,7 +584,6 @@ static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
 		return -EAGAIN;
 
 	kfree(cmd->iov);
-	if (cmd->req.sg_cnt)
 	sgl_free(cmd->req.sg);
 	cmd->queue->snd_cmd = NULL;
 	nvmet_tcp_put_cmd(cmd);
@@ -1310,7 +1307,6 @@ static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd)
 	nvmet_req_uninit(&cmd->req);
 	nvmet_tcp_unmap_pdu_iovec(cmd);
 	kfree(cmd->iov);
-	if (cmd->req.sg_cnt)
 	sgl_free(cmd->req.sg);
 }