[xen staging] arm/pci-designware: Fix MISRA violations

[patchbot@xxxxxxx]

commit 25bb2560ab08e80ce5dc5ace125a867b5377a6a1
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Feb 20 11:27:13 2026 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Feb 25 16:06:04 2026 +0000

    arm/pci-designware: Fix MISRA violations
    
     * Move includes inside the header guards (D4.10)
     * Use NULL in preference to 0 (R11.9)
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/pci/pci-designware.c | 2 +-
 xen/arch/arm/pci/pci-designware.h | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/pci/pci-designware.c 
b/xen/arch/arm/pci/pci-designware.c
index 0bd67524ac..6b85213f63 100644
--- a/xen/arch/arm/pci/pci-designware.c
+++ b/xen/arch/arm/pci/pci-designware.c
@@ -285,7 +285,7 @@ void __iomem *dw_pcie_child_map_bus(struct pci_host_bridge 
*bridge,
                                     bridge->child_cfg->phys_addr, busdev,
                                     bridge->child_cfg->size);
     if ( ret )
-        return 0;
+        return NULL;
 
     return bridge->child_cfg->win + where;
 }
diff --git a/xen/arch/arm/pci/pci-designware.h 
b/xen/arch/arm/pci/pci-designware.h
index b9deb3b138..bd93dab6f2 100644
--- a/xen/arch/arm/pci/pci-designware.h
+++ b/xen/arch/arm/pci/pci-designware.h
@@ -6,12 +6,11 @@
  * Based on xen/arch/arm/pci/pci-host-generic.c
  */
 
-#include <xen/pci.h>
-#include <xen/init.h>
-
 #ifndef __PCI_DESIGNWARE_H__
 #define __PCI_DESIGNWARE_H__
 
+#include <xen/pci.h>
+#include <xen/init.h>
 
 #define PCIE_ATU_VIEWPORT               0x900
 #define PCIE_ATU_REGION_OUTBOUND        0
--
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