sanitycheck not printing QEMU console in some cases

[andrewboie]

Reported by sanitycheck -i:

make[4]: Entering directory '/home/apboie/projects/zephyr4/sanity-out/qemu_x86/tests/kernel/irq_offload/arch.interrupt'
[100%] [QEMU] CPU: qemu32,+nx,+pae
qemu-system-i386: warning: Unknown firmware file in legacy mode: genroms/multiboot.bin

make[4]: *** [zephyr/CMakeFiles/run.dir/build.make:58: zephyr/CMakeFiles/run] Error 1

Actual output when same test (irq_offload with newlib enabled) run manually

qemu-system-i386: warning: Unknown firmware file in legacy mode: genroms/multiboot.bin

***** Booting Zephyr OS v1.12.0-926-g17620b001 *****
***** Stack Check Fail! *****
Current thread ID = 0x00401080
eax: 0x0040b02c, ebx: 0x004001e0, ecx: 0x00400020, edx: 0x0040b02c
esi: 0x00400020, edi: 0x004002c0, ebp: 0x004001e0, esp: 0x0040b000
eflags: 0x00000206 cs: 0x0008
call trace:
eip: 0x00003641
Fatal fault in essential thread! Spinning...
Terminate emulator due to fatal kernel error
make[3]: *** [zephyr/CMakeFiles/run.dir/build.make:60: zephyr/CMakeFiles/run] Error 1
make[2]: *** [CMakeFiles/Makefile2:307: zephyr/CMakeFiles/run.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:314: zephyr/CMakeFiles/run.dir/rule] Error 2
make: *** [Makefile:183: run] Error 2