[PATCH v2] libiberty(argv.c): Fix memory leak in expandargv.

[Jeff Law]

On 2/18/21 5:08 AM, Ayush Mittal via Gcc-patches wrote:
> libiberty/ChangeLog:
>
> 	* argv.c (expandargv): free allocated buffer if read fails.
I went ahead and committed this, even though we're in stage4 as other
projects use libiberty and it's a trivial enough change that they
shouldn't have to wait for the GCC development cycle to re-enter stage1.

Thanks,
Jeff