| Function SilcAsyncOperationAbort
 
 SYNOPSIS
 
    typedef void (*SilcAsyncOperationAbort)(SilcAsyncOperation op,
                                            void *context);
DESCRIPTION
    This callback is called when upper layer calls the silc_async_abort,
    and is used to actually perform the abortion of the asynchronous
    operation.  The silc_async_free must not be called in this function.
    This callback type can also be provided to silc_async_abort function
    by the upper layer, if it wants that callback is called to the upper
    layer when aborting the operation.
 
 
 
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