[clang][Sema][NFC] Remove an unnecessary static_cast

Author: tbaederr

clang/lib/Sema/SemaDecl.cpp

@@ -18215,8 +18215,8 @@ ExprResult Sema::VerifyBitField(SourceLocation FieldLoc,
 /// to create a FieldDecl object for it.
 Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
                        Declarator &D, Expr *BitfieldWidth) {
-  FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
-                               DeclStart, D, static_cast<Expr*>(BitfieldWidth),
+  FieldDecl *Res = HandleField(S, cast_if_present<RecordDecl>(TagD), DeclStart,
+                               D, BitfieldWidth,
                                /*InitStyle=*/ICIS_NoInit, AS_public);
   return Res;
 }