Fix compile error with NDEBUG #826

Job	Run time
build-cross (x86_64-w64-mingw32)	1m 3s
build-windows (x86)	1m 42s
build-cross (i686-w64-mingw32)	1m 56s
build (ubuntu-24.04, gcc, autotools)	43s
build-windows (x64)	40s
build (ubuntu-24.04, gcc, cmake)	39s
build (ubuntu-24.04, clang, autotools)	1m 1s
build (ubuntu-24.04, clang, distcheck)	1m 7s
build (ubuntu-24.04, clang, cmake)	41s
build (macos-13, gcc, autotools)	1m 18s
build (macos-13, gcc, cmake)	1m 12s
build (macos-13, clang, autotools)	1m 21s
build (macos-13, clang, cmake)	1m 10s
build (macos-14, gcc, autotools)	41s
build (macos-14, gcc, cmake)	42s
build (macos-14, clang, autotools)	46s
build (macos-14, clang, cmake)	41s
release	0s
	17m 23s

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