rpc: Fix crash on error paths of message dispatching
This patch resolves CVE-2013-0170: https://bugzilla.redhat.com/show_bug.cgi?id=893450 When reading and dispatching of a message failed the message was freed but wasn't removed from the message queue. After that when the connection was about to be closed the pointer for the message was still present in the queue and it was passed to virNetMessageFree which tried to call the callback function from an uninitialized pointer. This patch removes the message from the queue before it's freed. * rpc/virnetserverclient.c: virNetServerClientDispatchRead: - avoid use after free of RPC messages (cherry picked from commit 46532e3e)
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