23802b4fe0
This prints an error message, instead of core dump, when "-qtest" option value is invalid, e.g.: $ ./x86_64-softmmu/qemu-system-x86_64 -qtest unknown qemu-system-x86_64: Failed to initialize device for qtest: "unknown" Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>