Fix warning on nightly 2023-11-22 #2337

Job	Run time
Check MSRV	1m 15s
Check formatting	12s
Lint macOS 64bit	2m 35s
Lint iOS 32bit	1m 0s
Lint GNUStep + exceptions	1m 27s
Lint header-translator	31s
Lint test-assembly	32s
Test macOS 12	9m 16s
Assembly tests	3m 31s
Verify header translator output	1m 6s
Check icrate features	18m 58s
Test on iOS simulator w. dinghy	10m 20s
Test macOS 13	7m 56s
Compiler UI	2m 16s
Test macOS 11	10m 54s
Test Compiler-RT	36s
Build macOS AArch64	8m 6s
Test GNUStep with libobjc2 v1.9	4m 34s
Test macOS old SDK	6m 28s
Test GNUStep with libobjc2 v2.0	4m 29s
Test macOS nightly	14m 44s
Test GNUStep with libobjc2 v2.1 on nightly	4m 16s
Build macOS 32bit	9m 23s
Test GNUStep 32bit	2m 55s
Build iOS simulator ARM64	2m 25s
Build iOS ARM64	3m 58s
Build iOS ARMv7s	3m 56s
Build iOS 32bit x86	6m 49s
	2h 24m 28s

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