UE: Default initialize regionmap

Author: https://github.com/Hendiadyoin1
Commit: 74de4795dc
Pull-request: https://github.com/SerenityOS/serenity/pull/6179
Reviewed-by: https://github.com/awesomekling

Userland/DevTools/UserspaceEmulator/SoftMMU.h

@@ -112,7 +112,7 @@ public:
 private:
     Emulator& m_emulator;
 
-    Region* m_page_to_region_map[786432];
+    Region* m_page_to_region_map[786432] = { nullptr };
 
     OwnPtr<Region> m_tls_region;
     NonnullOwnPtrVector<Region> m_regions;