[libvirt] [PATCH] Fix segfault if no qemu emulator passed

[Cole Robinson <crobinso redhat com>]

There is unfortunately a pretty prevalent
segfault in the latest libvirt. If a qemu
domain is defined without an emulator
specified, libvirtd crashes.

This is doubly unfortunate since current
virtinst generates an emulator-less config
for all qemu and kvm guests (I'm about to fix
this upstream though).

Attached patch fixes this.

Thanks,
Cole

diff --git a/src/qemu_conf.c b/src/qemu_conf.c
index d742c32..23ef050 100644
--- a/src/qemu_conf.c
+++ b/src/qemu_conf.c
@@ -790,7 +790,7 @@ int qemudBuildCommandLine(virConnectPtr conn,
     if (!emulator)
         return -1;
 
-    ADD_ARG_LIT(vm->def->emulator);
+    ADD_ARG_LIT(emulator);
     ADD_ARG_LIT("-S");
     ADD_ARG_LIT("-M");
     ADD_ARG_LIT(vm->def->os.machine);