[clangd] Fix null check in FindTarget.

I've hit this stack trace a few times but don't have a good reproducer.
The code is unsafe by inspection, though.

(cherry picked from commit 9a5c448a31bacc08e73fcae4636094f9b6e2be6a)

1 files changed, 1 insertions, 1 deletions

diff --git a/clang-tools-extra/clangd/FindTarget.cpp b/clang-tools-extra/clangd/FindTarget.cpp
index 82a2e8c27d5..71bb9d3d506 100644
--- a/clang-tools-extra/clangd/FindTarget.cpp
+++ b/clang-tools-extra/clangd/FindTarget.cpp
@@ -229,7 +229,7 @@ public:
   }
 
   void add(const Decl *Dcl, RelSet Flags) {
-    const NamedDecl *D = llvm::dyn_cast<NamedDecl>(Dcl);
+    const NamedDecl *D = llvm::dyn_cast_or_null<NamedDecl>(Dcl);
     if (!D)
       return;
     debug(*D, Flags);