virsh: fix memleak when starting a guest with invalid fd

When start a guest with --pass-fd, if the argument of --pass-fd is invalid,
virsh will exit, but doesn't free the variable 'dom'.

The valgrind said:
...
==24569== 63 (56 direct, 7 indirect) bytes in 1 blocks are definitely lost in loss record 130 of 234
==24569==    at 0x4C2A1D4: calloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24569==    by 0x4E879A4: virAllocVar (viralloc.c:544)
==24569==    by 0x4EBD625: virObjectNew (virobject.c:190)
==24569==    by 0x4F3A18A: virGetDomain (datatypes.c:226)
==24569==    by 0x4F9311F: remoteDomainLookupByName (remote_driver.c:6636)
==24569==    by 0x4F44F20: virDomainLookupByName (libvirt.c:2277)
==24569==    by 0x12F616: vshCommandOptDomainBy (virsh-domain.c:105)
==24569==    by 0x131C79: cmdStart (virsh-domain.c:3330)
==24569==    by 0x12C4AB: vshCommandRun (virsh.c:1752)
==24569==    by 0x127001: main (virsh.c:3218)

https://bugzilla.redhat.com/show_bug.cgi?id=1067338Signed-off-by: NJincheng Miao <jmiao@redhat.com>
Signed-off-by: NEric Blake <eblake@redhat.com>

tools/virsh-domain.c

@@ -3427,12 +3427,11 @@ cmdStart(vshControl *ctl, const vshCmd *cmd)
 
     if (virDomainGetID(dom) != (unsigned int)-1) {
         vshError(ctl, "%s", _("Domain is already active"));
-        virDomainFree(dom);
-        return false;
+        goto cleanup;
     }
 
     if (cmdStartGetFDs(ctl, cmd, &nfds, &fds) < 0)
-        return false;
+        goto cleanup;
 
     if (vshCommandOptBool(cmd, "paused"))
         flags |= VIR_DOMAIN_START_PAUSED;