nvme/perf: remove trid_entry from TAILQ before freeing it

Fixes #246.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I0fd4f9922acad507180fef396ebbb5c2304f2dff

Reviewed-on: https://review.gerrithub.io/436994
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>

examples/nvme/perf/perf.c

@@ -1179,6 +1179,7 @@ unregister_trids(void)
 	struct trid_entry *trid_entry, *tmp;
 
 	TAILQ_FOREACH_SAFE(trid_entry, &g_trid_list, tailq, tmp) {
+		TAILQ_REMOVE(&g_trid_list, trid_entry, tailq);
 		free(trid_entry);
 	}
 }