Silence Coverity false positive

Coverity if failing to determine that 'priv.elements[i].length' is
actually valid when 'buf[i]' is non-NULL.  Initialise 'priv' to
zeros.
68 jobs for !5556 with 2998-cid-340918-uninitialized-variables-uninit in 18 minutes and 17 seconds (queued for 16 seconds)
latest detached
Status Job ID Name Coverage
  Autoconf
passed autoreconf #2084409
amd64 linux

00:00:18

 
  Precheck
passed clang-format #2084411
amd64 linux

00:00:15

passed coccinelle #2084412
amd64 linux

00:04:00

passed danger #2084476
amd64 linux

00:00:14

passed misc #2084410
amd64 linux

00:00:15

passed tarball-create #2084414
amd64 linux

00:01:43

passed danger #2084413
amd64 linux

00:00:16

 
  Build
passed clang:asan #2084428
amd64 linux

00:02:08

passed clang:buster:amd64 #2084431
amd64 linux

00:01:03

passed clang:freebsd12:amd64 #2084432
amd64 libvirt

00:01:10

passed clang:freebsd13:amd64 #2084433
amd64 libvirt

00:02:59

passed clang:openbsd:amd64 #2084434
amd64 libvirt

00:02:40

passed clang:tsan #2084430
amd64 linux

00:01:04

passed gcc:alpine3.14:amd64 #2084415
amd64 linux

00:01:01

passed gcc:asan #2084427
amd64 linux

00:01:34

passed gcc:bionic:amd64 #2084425
amd64 linux

00:00:51

passed gcc:bullseye:amd64 #2084419
amd64 linux

00:00:54

passed gcc:buster:amd64 #2084418
amd64 linux

00:00:45

passed gcc:buster:amd64cross32 #2084420
amd64 linux

00:00:58

passed gcc:focal:amd64 #2084426
amd64 linux

00:00:55

passed gcc:oraclelinux7:amd64 #2084416
amd64 linux

00:00:50

passed gcc:oraclelinux8:amd64 #2084417
amd64 linux

00:00:55

passed gcc:out-of-tree #2084422
amd64 linux

00:01:00

passed gcc:sid:amd64 #2084421
amd64 linux

00:01:01

passed gcc:tarball #2084423
amd64 linux

00:00:58

passed gcc:tsan #2084429
amd64 linux

00:00:55

passed gcc:tumbleweed:amd64 #2084424
amd64 linux

00:00:47

 
  Unit
passed unit:clang:asan #2084446
amd64 linux

00:01:33

passed unit:clang:buster:amd64 #2084449
amd64 linux

00:01:16

passed unit:clang:freebsd12:amd64 #2084450
amd64 libvirt

00:01:35

passed unit:clang:freebsd13:amd64 #2084451
amd64 libvirt

00:03:21

passed unit:clang:openbsd:amd64 #2084452
amd64 libvirt

00:03:41

passed unit:clang:tsan #2084448
amd64 linux

00:03:17

passed unit:gcc:alpine3.14:amd64 #2084435
amd64 linux

00:01:19

passed unit:gcc:asan #2084445
amd64 linux

00:01:33

passed unit:gcc:bionic:amd64 #2084443
amd64 linux

00:01:17

passed unit:gcc:bullseye:amd64 #2084439
amd64 linux

00:01:14

passed unit:gcc:buster:amd64 #2084438
amd64 linux

00:02:30

passed unit:gcc:buster:amd64cross32 #2084440
amd64 linux

00:01:38

passed unit:gcc:focal:amd64 #2084444
amd64 linux

00:01:17

passed unit:gcc:oraclelinux7:amd64 #2084436
amd64 linux

00:01:29

passed unit:gcc:oraclelinux8:amd64 #2084437
amd64 linux

00:01:23

passed unit:gcc:sid:amd64 #2084441
amd64 linux

00:01:34

passed unit:gcc:tsan #2084447
amd64 linux

00:04:18

passed unit:gcc:tumbleweed:amd64 #2084442
amd64 linux

00:01:14

 
  System
passed system:clang:asan #2084464
amd64 linux

00:12:33

passed system:clang:buster:amd64 #2084467
amd64 linux

00:10:51

passed system:clang:freebsd12:amd64 #2084468
amd64 libvirt

00:11:21

passed system:clang:freebsd13:amd64 #2084469
amd64 libvirt

00:13:16

passed system:clang:tsan #2084466
amd64 linux

00:16:36

passed system:gcc:alpine3.14:amd64 #2084453
amd64 linux

00:11:38

passed system:gcc:asan #2084463
amd64 linux

00:13:37

passed system:gcc:bionic:amd64 #2084461
amd64 linux

00:10:33

passed system:gcc:bullseye:amd64 #2084457
amd64 linux

00:11:02

passed system:gcc:buster:amd64 #2084456
amd64 linux

00:11:39

passed system:gcc:buster:amd64cross32 #2084458
amd64 linux

00:11:41

passed system:gcc:focal:amd64 #2084462
amd64 linux

00:10:56

passed system:gcc:oraclelinux7:amd64 #2084454
amd64 linux

00:10:55

passed system:gcc:oraclelinux8:amd64 #2084455
amd64 linux

00:10:54

passed system:gcc:sid:amd64 #2084459
amd64 linux

00:10:52

passed system:gcc:tsan #2084465
amd64 linux

00:16:27

passed system:gcc:tumbleweed:amd64 #2084460
amd64 linux

00:11:40

 
  Docs
passed docs #2084470
amd64 linux

00:00:48

 
  Postcheck
passed cppcheck #2084474
amd64 linux

00:00:26

passed flake8 #2084471
amd64 linux

00:00:22

passed gcov #2084475
amd64 linux

00:00:33

78.0%
passed pylint #2084472
amd64 linux

00:00:29

passed scan-build #2084473
amd64 linux

00:04:31