Revert "Merge pull request #7732 from heyitsanthony/lease-err-ka"

This reverts commit fbbc4a4979, reversing
changes made to f254e38385.

Fixes #7851

proxy/grpcproxy/lease.go

@@ -255,7 +255,10 @@ func (lps *leaseProxyStream) recvLoop() error {
 func (lps *leaseProxyStream) keepAliveLoop(leaseID int64, neededResps *atomicCounter) error {
 	cctx, ccancel := context.WithCancel(lps.ctx)
 	defer ccancel()
-	respc := lps.lessor.KeepAlive(cctx, clientv3.LeaseID(leaseID))
+	respc, err := lps.lessor.KeepAlive(cctx, clientv3.LeaseID(leaseID))
+	if err != nil {
+		return err
+	}
 	// ticker expires when loop hasn't received keepalive within TTL
 	var ticker <-chan time.Time
 	for {
@@ -273,7 +276,7 @@ func (lps *leaseProxyStream) keepAliveLoop(leaseID int64, neededResps *atomicCou
 			lps.mu.Unlock()
 			return nil
 		case rp, ok := <-respc:
-			if !ok || rp.Err != nil {
+			if !ok {
 				lps.mu.Lock()
 				delete(lps.keepAliveLeases, leaseID)
 				lps.mu.Unlock()