Fix: clang11 warnings

This trying to fix the clang 11 build warnings we observe in this LHCb nightly

added code cleanup label

assigned to @clemenci

added lhcb-gaudi-head label

• [2021-08-24 00:05] Validation started with lhcb-gaudi-head#3017
• [2021-08-24 00:51] Validation started with lhcb-run2-gaudi-head#185
• [2021-08-25 00:03] Validation started with lhcb-dd4hep#904
• [2021-08-25 00:03] Validation started with lhcb-gaudi-head#3018
• [2021-08-25 00:13] Validation started with lhcb-gaussino-fastsim#90
• [2021-08-25 00:13] Validation started with lhcb-gaussino#1019
• [2021-08-25 00:22] Validation started with lhcb-lcg-dev3#1733
• [2021-08-25 00:23] Validation started with lhcb-lcg-dev4#1748
• [2021-08-25 00:52] Validation started with lhcb-run2-gaudi-head#186
• [2021-08-25 00:55] Validation started with lhcb-run2-patches-dev4#794
• [2021-08-25 00:59] Validation started with lhcb-sanitizers#937
• [2021-08-26 00:03] Validation started with lhcb-gaudi-head#3019
• [2021-08-26 00:16] Validation started with lhcb-lcg-dev3#1734
• [2021-08-26 00:20] Validation started with lhcb-lcg-dev4#1749
• [2021-08-26 00:41] Validation started with lhcb-sanitizers#938
• [2021-08-26 00:45] Validation started with lhcb-run2-patches-dev4#795
• [2021-08-27 00:05] Validation started with lhcb-gaudi-head#3020
• [2021-08-27 00:05] Validation started with lhcb-dd4hep#905
• [2021-08-27 00:18] Validation started with lhcb-lcg-dev3#1735
• [2021-08-27 00:20] Validation started with lhcb-lcg-dev4#1750
• [2021-08-27 00:38] Validation started with lhcb-run2-patches-dev4#796
• [2021-08-27 00:40] Validation started with lhcb-sanitizers#939
• [2021-08-28 00:04] Validation started with lhcb-dd4hep#906
• [2021-08-28 00:05] Validation started with lhcb-gaudi-head#3021
• [2021-08-28 00:15] Validation started with lhcb-lcg-dev3#1736
• [2021-08-28 00:16] Validation started with lhcb-lcg-dev4#1751
• [2021-08-28 00:39] Validation started with lhcb-sanitizers#940
• [2021-08-28 00:42] Validation started with lhcb-run2-patches-dev4#797
• [2021-08-29 00:06] Validation started with lhcb-lcg-dev3#1737
• [2021-08-29 00:07] Validation started with lhcb-lcg-dev4#1752
• [2021-08-29 00:11] Validation started with lhcb-run2-patches-dev4#798
• [2021-08-30 00:04] Validation started with lhcb-gaudi-head#3022
• [2021-08-30 00:04] Validation started with lhcb-dd4hep#907
• [2021-08-30 00:11] Validation started with lhcb-lcg-dev3#1738
• [2021-08-30 00:18] Validation started with lhcb-lcg-dev4#1753
• [2021-08-30 00:33] Validation started with lhcb-sanitizers#941
• [2021-08-30 00:38] Validation started with lhcb-run2-patches-dev4#799
• [2021-08-31 00:04] Validation started with lhcb-dd4hep#908
• [2021-08-31 00:10] Validation started with lhcb-gaussino-fastsim#91
• [2021-08-31 00:11] Validation started with lhcb-gaussino#1020
• [2021-08-31 00:14] Validation started with lhcb-lcg-dev3#1739
• [2021-08-31 00:15] Validation started with lhcb-lcg-dev4#1754
• [2021-08-31 00:20] Validation started with lhcb-run2-patches-dev4#800
• [2021-09-01 00:04] Validation started with lhcb-dd4hep#909
• [2021-09-01 00:05] Validation started with lhcb-gaudi-head#3023
• [2021-09-01 00:12] Validation started with lhcb-gaussino-fastsim#92
• [2021-09-01 00:15] Validation started with lhcb-gaussino#1021
• [2021-09-01 00:19] Validation started with lhcb-lcg-dev3#1740
• [2021-09-01 00:22] Validation started with lhcb-lcg-dev4#1755
• [2021-09-01 00:49] Validation started with lhcb-run2-patches-dev4#801
• [2021-09-01 00:49] Validation started with lhcb-run2-gaudi-head#187
• [2021-09-01 00:59] Validation started with lhcb-sanitizers#942
• [2021-09-02 00:07] Validation started with lhcb-dd4hep#910
• [2021-09-02 00:07] Validation started with lhcb-gaudi-head#3024
• [2021-09-02 00:13] Validation started with lhcb-gaussino-fastsim#93
• [2021-09-02 00:16] Validation started with lhcb-gaussino#1022
• [2021-09-02 00:18] Validation started with lhcb-lcg-dev3#1741
• [2021-09-02 00:19] Validation started with lhcb-lcg-dev4#1756
• [2021-09-02 00:46] Validation started with lhcb-run2-patches-dev4#802
• [2021-09-02 00:50] Validation started with lhcb-sanitizers#943

removed lhcb-gaudi-head label

added all-slots label

approved this merge request

changed milestone to %v36r1

mentioned in commit 8fc49e61

merged