[bug-libunistring] Use after free in libunistring-0.9.10

[Jeffrey Walton]

Hi Everyone,

I'm building libunistring-0.9.10 on Fedora 32 with GCC 10. GCC 10
includes the analyzer. The analyzer can be enabled by adding -fanalyze
to CFLAGS and LDFLAGS.

The analyzer is producing some use-after-free and double-free findings
on libunistring-0.9.10.

Could someone please make a testing pass on libunistring and take a
look at the findings.

Thanks in advance.