Verifier: Remove unnecessary null check

This is already assumed to be non-null above due to a dyn_cast<>.  Also
remove extraneous braces around statement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232292 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed