[heap] remove redundant branch in AllocateReadOnlyPage

Change-Id: I6411c752e3de1fb6e1547ccfe41265c5615eb421
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3296148
Auto-Submit: Jianxiao Lu <jianxiao.lu@intel.com>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78037}

src/heap/memory-allocator.cc

@@ -584,10 +584,8 @@ template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE)
 
 ReadOnlyPage* MemoryAllocator::AllocateReadOnlyPage(size_t size,
                                                     ReadOnlySpace* owner) {
-  BasicMemoryChunk* chunk = nullptr;
-  if (chunk == nullptr) {
-    chunk = AllocateBasicChunk(size, size, NOT_EXECUTABLE, owner);
-  }
+  BasicMemoryChunk* chunk =
+      AllocateBasicChunk(size, size, NOT_EXECUTABLE, owner);
   if (chunk == nullptr) return nullptr;
   return owner->InitializePage(chunk);
 }