[libvirt] [PATCH 5/6] rpc: don't destroy xdr before creating it in virNetMessageEncodeHeader

[Eric Blake]

> On OOM, xdr_destroy got called on xdr even though it wasn't created
> yet.
> 
> Found by coverity:
> Error: UNINIT (CWE-457):
>     libvirt-0.10.2/src/rpc/virnetmessage.c:214: var_decl: Declaring
>     variable "xdr" without initializer.
>     libvirt-0.10.2/src/rpc/virnetmessage.c:219: cond_true: Condition
>     "virReallocN(&msg->buffer, 1UL /* sizeof (*msg->buffer) */,
>     msg->bufferLength) < 0", taking true branch
>     libvirt-0.10.2/src/rpc/virnetmessage.c:221: goto: Jumping to
>     label
>     "cleanup"
>     libvirt-0.10.2/src/rpc/virnetmessage.c:257: label: Reached label
>     "cleanup"
>     libvirt-0.10.2/src/rpc/virnetmessage.c:258: uninit_use: Using
>     uninitialized value "xdr.x_ops".
> ---
>  src/rpc/virnetmessage.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)

ACK.