virnetdev: Resolve Coverity FORWARD_NULL
The complaint is that if cleanup is called when virFileReadAll fails, then mcast->entries is NULL and could be dereferenced in the clear function. After following the code some - I saw that the caller to the function (virNetDevGetMulticastTable) will also call virNetDevMcastListClear if this function returns -1, so this isn't necessary, so I removed the call.
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