iolog: add va_end on error #913

Job	Run time
build-containers (debian, debian, bookworm, x86_64)	12m 47s
build (linux-gcc)	14m 44s
build-containers (fedora, fedora, 40, x86_64)	14m 7s
build (linux-clang)	12m 8s
build-containers (alma, almalinux, 9, x86_64)	13m 56s
build (macos)	15m 8s
build-containers (oracle, oraclelinux, 9, x86_64)	14m 15s
build (linux-i686-gcc)	13m 12s
build-containers (rocky, rockylinux, 9, x86_64)	14m 24s
build (android)	42s
build-containers (ubuntu, ubuntu, noble, i686)	13m 44s
build (windows-cygwin-64)	16m 4s
build-containers (ubuntu, ubuntu, noble, x86_64)	14m 9s
build (windows-cygwin-32)	16m 28s
build (windows-msys2-64)	13m 36s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	39s
	3h 20m 3s

Provide feedback