Prevents an unlikely uninitialized access

There is no uninitialized access in the given code. Even if there was, initialization to NULL would not be the right fix: at best, it would make the crash more deterministic, but it would still be a crash.

If this is an attempt to suppress a false positive finding of a static analyzer - this is fine: I don't mind trivial changes to satify static analyzer, if they have no impact on readability, performance or anything else, but let's be explicit in this case.

This initialization addresses the static analyzer finding: "variable 'cc' may be uninitialized when used here." While there’s no actual uninitialized access in the current code, setting cc to NULL serves as a defensive measure. This ensures a deterministic crash if cc were ever accessed before initialization, preventing silent corruption of CodeCache that could otherwise lead to incorrect results or crashes elsewhere or here.

Although a crash from uninitialized access isn’t currently possible here, initializing to NULL not only satisfies the static analyzer but also protects against potential future code changes that might unintentionally introduce uninitialized access to cc.