[llvm] [VPlan][Coverity] Fix coverity CID1579964. (PR #121805)

[via llvm-commits]

offsake wrote:

Hi @fhahn,

could you please review as I expect the relevant code was introduced with:

commit 416a5080d89066029f9889dc23f94de47c2fa895
Author: Florian Hahn <flo at fhahn.com>
Date:   Sat Jun 4 21:22:32 2022 +0100

    [VPlan] Update vector latch terminator edge to exit block after execution.

Thanks!

https://github.com/llvm/llvm-project/pull/121805