Fix a memory leak bug for umr tool.

[张二东]

Hi: 
       The function umr_pm4_decode_ring_is_halted call umr_read_ring_data

    to get ringdata, umr_read_ring_data will alloc memory to store ring

    data and return the memory pointer to umr_pm4_decode_ring_is_halted, So

    the memory should be free in umr_pm4_decode_ring_is_halted.


Thanks.
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