修复colm -x参数执行core dump问题 · Pull Request !6 · src-openEuler/colm

问题根因:
strdup函数传入的指针参数为空，导致指针解引用失败，出现段错误。

解决办法:
strdup添加参数非空判断，如果参数不为空才传参到strdup。

测试用例运行结果:

```
[root@localhost test-colm]# ./oe_test_colm.sh
Start to prepare the test environment.
End to prepare the test environment.
Start to run test.
usage: colm [options] file
   -h, -H, -?, --help   print this usage and exit
0
Colm version 0.14.7 February 2021
0
compiling with: 'gcc -Wall -Wwrite-strings -g -o mu mu.c -I/usr/include -L/usr/lib -Wl,-rpath,/usr/lib -lcolm'
0
0
mu: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=216284ca238a1de16f3d6c14e935234cc0968f99, for GNU/Linux 3.7.0, with debug_info, not stripped
0
void zhu_read_reduce( program_t *prg, int reducer, input_t *stream );
        &zhu_read_reduce,
void zhu_read_reduce( program_t *prg, int reducer, input_t *stream ) {}
0
0
void colm_object_read_reduce( program_t *prg, int reducer, input_t *stream );
        &colm_object_read_reduce,
void colm_object_read_reduce( program_t *prg, int reducer, input_t *stream ) {}
0
0
0
mu: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=3405be5463e0f3b1e05ccea8c1200ac7808e4674, for GNU/Linux 3.7.0, with debug_info, not stripped
0
void colm_object_read_reduce( program_t *prg, int reducer, input_t *stream );
        &colm_object_read_reduce,
void colm_object_read_reduce( program_t *prg, int reducer, input_t *stream ) {}
0
0
0
zhu: C source, ASCII text
0
0
0
mu: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=dd3ae7e46d0d58d83ace161b771a58044b210823, for GNU/Linux 3.7.0, with debug_info, not stripped
0
0
0
0
0
0
0
digraph  {
0
End to run test.
Start to restore the test environment.
End to restore the test environment.
[root@localhost test-colm]#
```

issue: https://gitee.com/src-openeuler/colm/issues/I9DT51?from=project-issue

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