[XEN PATCH 2/5] x86/ioapic: use NULL as a null pointer constant

[Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>]

Resolves violations of MISRA C Rule 11.9.
No functional change.

Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
---
 xen/arch/x86/io_apic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c
index d11c880544e6..dd25ba394301 100644
--- a/xen/arch/x86/io_apic.c
+++ b/xen/arch/x86/io_apic.c
@@ -207,7 +207,7 @@ struct IO_APIC_route_entry **alloc_ioapic_entries(void)
 
     ioapic_entries = xmalloc_array(struct IO_APIC_route_entry *, nr_ioapics);
     if (!ioapic_entries)
-        return 0;
+        return NULL;
 
     for (apic = 0; apic < nr_ioapics; apic++) {
         ioapic_entries[apic] =
@@ -224,7 +224,7 @@ nomem:
         xfree(ioapic_entries[apic]);
     xfree(ioapic_entries);
 
-    return 0;
+    return NULL;
 }
 
 union entry_union {
-- 
2.34.1