Add a callback to the buffer_pool_alloc function.

The goal is to detect in the net_buf_ctrl if there is no more free buffer in a fifo, which indicates there will be a deadlock if the engine is not unpaused.
Currently this detection is done from the "put" callback, it's not a safe solution, nothing prevents a demuxer to allocate 2 buffers before calling put().
The impact is low, only one test per buffer_pool_alloc call if no callback is registered.
It's done exactly the same way as the put and get callbacks.

CVS patchset: 5520
CVS date: 2003/10/14 22:16:32

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