Kernel: Simplify PCI::MMIOAccess segment storage

Instead of nesting a bunch of heap allocations, just store them in
a simple HashMap<u16, MMIOSegment>.

Also fix a bunch of double hash lookups like this:

    ASSERT(map.contains(key));
    auto thing = map.get(key).value();

They now look like this instead:

    auto thing = map.get(key);
    ASSERT(thing.has_value());

1 files changed, 1 insertions, 1 deletions

diff --git a/Kernel/PCI/MMIOAccess.h b/Kernel/PCI/MMIOAccess.h
index 47de911fda..e24a329684 100644
--- a/Kernel/PCI/MMIOAccess.h
+++ b/Kernel/PCI/MMIOAccess.h
@@ -63,7 +63,7 @@ private:
     virtual u8 segment_end_bus(u32) const override;
 
     PhysicalAddress m_mcfg;
-    HashMap<u16, MMIOSegment*>& m_segments;
+    HashMap<u16, MMIOSegment> m_segments;
     OwnPtr<Region> m_mmio_window_region;
     ChangeableAddress m_mapped_address;
 };