tests/qtest/hd-geo-test: Check for availability of "pc" machine before using it

In case QEMU has been configured with "--without-default-devices", the
"pc" machine type might be missing in the binary. We should check for
its availability before using it.

Message-ID: <20240905191434.694440-5-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed