MPRQ buffer reference was not decremented upon MLX5_RXQ_CODE_NOMBUF

https://bugs.dpdk.org/show_bug.cgi?id=1778

            Bug ID: 1778
           Summary: MPRQ buffer reference was not decremented upon
                    MLX5_RXQ_CODE_NOMBUF
           Product: DPDK
           Version: 22.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

drivers/net/mlx5/mlx5_rx.h mprq_buf_to_pkt(...):

In the external buffer attach case where hdrm_overlap > 0, the code did not decrement the buffer refcnt if allocation struct rte_mbuf *next = rte_pktmbuf_alloc(rxq->mp) fails

mprq_buf_to_pkt(...) {
    ...        
    if (hdrm_overlap > 0) {
        __atomic_add_fetch(&buf->refcnt, 1, __ATOMIC_RELAXED);
        ...
        MLX5_ASSERT(rxq->strd_scatter_en);
        struct rte_mbuf *seg = rte_pktmbuf_alloc(rxq->mp);
        if (unlikely(seg == NULL))
            return MLX5_RXQ_CODE_NOMBUF;
        SET_DATA_OFF(seg, 0);
        ...
    }
}

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