在没有package_cpus_list的机器上，topo_init导致程序崩溃

合入PR https://gitee.com/openeuler/wayca-scheduler/pulls/24之后，在topo_init（）阶段问题解决，
但是在topo_free()阶段仍然会崩溃，附gdb日志：
[...]
Reading symbols from ./test/wayca_sc_group...
(gdb) r
Starting program: /home/cong/wayca-deployer/test/wayca_sc_group
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
get package 0 package_cpu_list fail, ret = -2
get cpu 0 topology fail, ret = -2

Program received signal SIGSEGV, Segmentation fault.
0x00007fffff796be1 in topo_free () at lib/topo.c:1077
1077                    CPU_FREE(p_topo->cpus[i]->core_cpus_map);
(gdb) bt
#0  0x00007fffff796be1 in topo_free () at lib/topo.c:1077
#1  0x00007fffff796b80 in topo_init () at lib/topo.c:924
#2  0x00007fffff7c1b8a in ?? () from /lib64/ld-linux-x86-64.so.2
#3  0x00007fffff7c1c91 in ?? () from /lib64/ld-linux-x86-64.so.2
#4  0x00007fffff7b113a in ?? () from /lib64/ld-linux-x86-64.so.2
#5  0x0000000000000001 in ?? ()
#6  0x00007ffffffee567 in ?? ()
#7  0x0000000000000000 in ?? ()

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