[BUG] Bug report from static analysis

Hello.

I love that you shared your projects with the world. Thank you for that!

I checked FreeRTOS using the PVS-Studio static analyzer and published an article: "How PVS-Studio helps enhance quality of embedded projects".

Perhaps you would like to take a look.

We analyzed the project for the c73a397 commit using PVS-Studio 7.43. You can find all code fragments in the article: "How PVS-Studio helps enhance quality of embedded projects".