[clang] [analyzer] Fix unjustified early return in processCallExit (PR #205656)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

> That said, do you think we could add a unittest for splitting inside removeDead?

I guess it would be a simple unittest. However I'm not sure that it will ever become useful now that I found and fixed this one issue.

https://github.com/llvm/llvm-project/pull/205656