Fix warnings coming up with clang 17 #6

Job	Run time
Sigrok artifact builder / PulseView AppImage build (x86_64) (Release)	2m 55s
Sigrok artifact builder / PulseView MXE build (i686) (Release)	2m 49s
Sigrok artifact builder / PulseView macOS build for ARM	5m 3s
Sigrok artifact builder / PulseView AppImage build (x86_64) (Debug)	2m 56s
Sigrok artifact builder / PulseView macOS build for x86	5m 41s
Sigrok artifact builder / PulseView MXE build (i686) (Debug)	2m 43s
Sigrok artifact builder / PulseView MXE build (x86_64) (Release)	2m 47s
Sigrok artifact builder / PulseView MXE build (x86_64) (Debug)	2m 46s
Sigrok artifact builder / sigrok-cli AppImage build (${{ matrix.target.target }})	0s
Sigrok artifact builder / sigrok-cli macOS build for ARM	0s
Sigrok artifact builder / sigrok-cli macOS build for x86	0s
Sigrok artifact builder / sigrok-cli MXE build (${{ matrix.target.target }})	0s
Sigrok artifact builder / Debug output	1s
Sigrok artifact builder / Announce sigrok-cli builds in PR	0s
Sigrok artifact builder / Create continuous sigrok-cli release and add artifacts to it	0s
Sigrok artifact builder / Announce PV builds in PR	0s
Sigrok artifact builder / Create continuous PulseView release and add artifacts to it	0s
Sigrok artifact builder / Create continuous release and add artifacts to it	0s
	27m 41s

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