[static analysis] fix list_ticket memleak #39
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There is no one-off string present in the accumulated output. Furthermore, the space reserved for each ticket is more than enough per my back-of-the-envelope calculation for the worst case (BOOTH_NAME_LEN * 2 + 92).
Note that such a case seems impossible but there may be other issues that will add up (see, e.g., reckless snprintf use pointed out with ClusterLabs/pacemaker#810, something should eventually be reflected here as well). Discovered-by: static analysis/Coverity
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