[xen staging] xen/arm: Use FDT_MAGIC from libfdt instead of local macro

[patchbot@xxxxxxx]

commit c53f71b2ee16f38f009d5b5b1a1a6f310ee36fc7
Author:     Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
AuthorDate: Wed Nov 12 09:50:25 2025 +0000
Commit:     Julien Grall <julien@xxxxxxx>
CommitDate: Sun Nov 16 12:19:02 2025 +0000

    xen/arm: Use FDT_MAGIC from libfdt instead of local macro
    
    Remove the redundant local 'DTB_MAGIC' definition and replace its usage
    with the canonical 'FDT_MAGIC' from 'libfdt'.
    
    Amends: 66edeb2e3972 (arm: copy DTB appended to zImage)
    Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
    Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/arch/arm/kernel.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c
index 48f4b56d0c..7544fd50a2 100644
--- a/xen/arch/arm/kernel.c
+++ b/xen/arch/arm/kernel.c
@@ -40,8 +40,6 @@ struct minimal_dtb_header {
     /* There are other fields but we don't use them yet. */
 };
 
-#define DTB_MAGIC 0xd00dfeedU
-
 static void __init place_modules(struct kernel_info *info,
                                  paddr_t kernbase, paddr_t kernend)
 {
@@ -383,7 +381,7 @@ static int __init kernel_zimage32_probe(struct kernel_info 
*info,
     if ( addr + end - start + sizeof(dtb_hdr) <= size )
     {
         copy_from_paddr(&dtb_hdr, addr + end - start, sizeof(dtb_hdr));
-        if (be32_to_cpu(dtb_hdr.magic) == DTB_MAGIC) {
+        if (be32_to_cpu(dtb_hdr.magic) == FDT_MAGIC) {
             end += be32_to_cpu(dtb_hdr.total_size);
 
             if ( end > addr + size )
--
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