TT#87201 ndb_redis remove useless error message

> ERROR: ndb_redis [redis_client.c:903]: redisc_exec_argv(): Redis error: Server closed the connection

Change-Id: Ife5be1087993f54e785a11e60e1b0f0e8d407547
(cherry picked from commit 590f81e3a0)

debian/patches/series

@@ -73,6 +73,7 @@ upstream/pv-xavi-.-config-variables-implementation.patch
 upstream/core-PV_IDX_NONE-to-point-that-pv-had-no-index.patch
 upstream/pv-fix-for-new-PV_IDX_NONE-value.patch
 upstream/pv_headers-fix-x_hdr-index-on-get.patch
+upstream/ndb_redis-set-message-level-to-debug-on-exec.patch
 ## backport from kamailio trunk (5.3)
 #
 ### relevant for upstream

debian/patches/upstream/ndb_redis-set-message-level-to-debug-on-exec.patch

@@ -0,0 +1,27 @@
+From: Victor Seva <linuxmaniac@torreviejawireless.org>
+Date: Wed, 23 Sep 2020 09:01:43 +0200
+Subject: [PATCH] ndb_redis: set message level to debug on exec
+
+* logging error makes no sense here since there's going
+  to be a reconnection afterwards
+
+> ERROR: ndb_redis [redis_client.c:903]: redisc_exec_argv(): Redis error: Server closed the connection
+
+(cherry picked from commit a9c331d70dbed6827874aa99296203ac5a9d5c7b)
+---
+ src/modules/ndb_redis/redis_client.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/modules/ndb_redis/redis_client.c b/src/modules/ndb_redis/redis_client.c
+index 5ad063f..bd97012 100644
+--- a/src/modules/ndb_redis/redis_client.c
++++ b/src/modules/ndb_redis/redis_client.c
+@@ -770,7 +770,7 @@ int redisc_exec_pipelined(redisc_server_t *rsrv)
+ 		/* null reply, reconnect and try again */
+ 		if (rsrv->ctxRedis->err)
+ 		{
+-			LM_ERR("Redis error: %s\n", rsrv->ctxRedis->errstr);
++			LM_DBG("Redis error: %s\n", rsrv->ctxRedis->errstr);
+ 		}
+ 		if (redisc_create_pipelined_message(rsrv) == 0)
+ 		{