Fix warning on nightly 2023-11-22 #2335

Job	Run time
Check MSRV	1m 13s
Lint macOS 64bit	2m 46s
Check formatting	10s
Lint iOS 32bit	1m 0s
Lint GNUStep + exceptions	1m 23s
Lint header-translator	34s
Lint test-assembly	30s
Test macOS 12	5m 5s
Check icrate features	11m 46s
Verify header translator output	1m 7s
Assembly tests	3m 36s
Test macOS 13	1s
Test macOS 11	1m 24s
Test Compiler-RT	31s
Test GNUStep with libobjc2 v1.9	4m 45s
Test on iOS simulator w. dinghy	9m 12s
Build macOS AArch64	2m 44s
Test macOS old SDK	1s
Test GNUStep with libobjc2 v2.0	4m 18s
Compiler UI	1m 53s
Test macOS nightly	1s
Test GNUStep with libobjc2 v2.1 on nightly	4m 4s
Build macOS 32bit	1m 47s
Test GNUStep 32bit	2m 55s
Build iOS simulator ARM64	3m 54s
Build iOS ARM64	3m 0s
Build iOS ARMv7s	5m 32s
Build iOS 32bit x86	4m 53s
	1h 20m 5s

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