[lldb][ClangASTImporter][NFC] Remove redundant do-while loop (#77596)

This seems to have always been a redundant do-while since its
introduction in `2e93a2ad2148d19337bf5f9885e46e3c00e8ab82`.

Author: Michael137

lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.cpp

@@ -943,44 +943,41 @@ void ClangASTImporter::ASTImporterDelegate::ImportDefinitionTo(
   // the class was originally sourced from symbols.
 
   if (ObjCInterfaceDecl *to_objc_interface = dyn_cast<ObjCInterfaceDecl>(to)) {
-    do {
-      ObjCInterfaceDecl *to_superclass = to_objc_interface->getSuperClass();
+    ObjCInterfaceDecl *to_superclass = to_objc_interface->getSuperClass();
 
-      if (to_superclass)
-        break; // we're not going to override it if it's set
+    if (to_superclass)
+      return; // we're not going to override it if it's set
 
-      ObjCInterfaceDecl *from_objc_interface =
-          dyn_cast<ObjCInterfaceDecl>(from);
+    ObjCInterfaceDecl *from_objc_interface = dyn_cast<ObjCInterfaceDecl>(from);
 
-      if (!from_objc_interface)
-        break;
+    if (!from_objc_interface)
+      return;
 
-      ObjCInterfaceDecl *from_superclass = from_objc_interface->getSuperClass();
+    ObjCInterfaceDecl *from_superclass = from_objc_interface->getSuperClass();
 
-      if (!from_superclass)
-        break;
+    if (!from_superclass)
+      return;
 
-      llvm::Expected<Decl *> imported_from_superclass_decl =
-          Import(from_superclass);
+    llvm::Expected<Decl *> imported_from_superclass_decl =
+        Import(from_superclass);
 
-      if (!imported_from_superclass_decl) {
-        LLDB_LOG_ERROR(log, imported_from_superclass_decl.takeError(),
-                       "Couldn't import decl: {0}");
-        break;
-      }
+    if (!imported_from_superclass_decl) {
+      LLDB_LOG_ERROR(log, imported_from_superclass_decl.takeError(),
+                     "Couldn't import decl: {0}");
+      return;
+    }
 
-      ObjCInterfaceDecl *imported_from_superclass =
-          dyn_cast<ObjCInterfaceDecl>(*imported_from_superclass_decl);
+    ObjCInterfaceDecl *imported_from_superclass =
+        dyn_cast<ObjCInterfaceDecl>(*imported_from_superclass_decl);
 
-      if (!imported_from_superclass)
-        break;
+    if (!imported_from_superclass)
+      return;
 
-      if (!to_objc_interface->hasDefinition())
-        to_objc_interface->startDefinition();
+    if (!to_objc_interface->hasDefinition())
+      to_objc_interface->startDefinition();
 
-      to_objc_interface->setSuperClass(m_source_ctx->getTrivialTypeSourceInfo(
-          m_source_ctx->getObjCInterfaceType(imported_from_superclass)));
-    } while (false);
+    to_objc_interface->setSuperClass(m_source_ctx->getTrivialTypeSourceInfo(
+        m_source_ctx->getObjCInterfaceType(imported_from_superclass)));
   }
 }