[lldb] NFC: Remove the extra ';'

Summary:
Remove extra `;` to eliminate the following pedantic warning.

```
warning: extra ';' [-Wpedantic]

```

Reviewers: shafik

Reviewed By: shafik

Subscribers: abidh, lldb-commits

Differential Revision: https://reviews.llvm.org/D54528

llvm-svn: 347047