Fix warnings reported when -Wpedantic is used #2293

Job	Run time
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/gcc-9, /usr/bin/g++-9, 98)	8m 41s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/gcc-9, /usr/bin/g++-9, 11)	25m 29s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/gcc-9, /usr/bin/g++-9, 17)	30m 24s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/gcc-10, /usr/bin/g++-10, 98)	7m 38s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/gcc-10, /usr/bin/g++-10, 11)	23m 18s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/gcc-10, /usr/bin/g++-10, 17)	27m 10s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/clang, /usr/bin/clang++, 98)	9m 18s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/clang, /usr/bin/clang++, 11)	29m 43s
build-ubuntu-dep-apt (ubuntu-20.04, /usr/bin/clang, /usr/bin/clang++, 17)	34m 3s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/gcc-9, /usr/bin/g++-9, 98)	7m 35s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/gcc-9, /usr/bin/g++-9, 11)	21m 18s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/gcc-9, /usr/bin/g++-9, 17)	25m 56s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/gcc-10, /usr/bin/g++-10, 98)	7m 13s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/gcc-10, /usr/bin/g++-10, 11)	23m 34s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/gcc-10, /usr/bin/g++-10, 17)	27m 4s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/clang, /usr/bin/clang++, 98)	9m 27s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/clang, /usr/bin/clang++, 11)	32m 21s
build-ubuntu-dep-apt (ubuntu-latest, /usr/bin/clang, /usr/bin/clang++, 17)	35m 43s
	6h 25m 55s

Provide feedback