migration: unify stdio-based QEMUFile operations
Now that qemu_fseek does not exist anymore, there is no reason to do an fseek before fread/fwrite when operating on an stdio file. Thus, unify the get/put_buffer callbacks used by qemu_fopen with those used for pipes. Reviewed-by: NOrit Wasserman <owasserm@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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