From: Eric Auger <eric.auger@redhat.com>

Make sure a null SMMUPciBus is returned in case we were
not able to identify a pci bus matching the @bus_num.

This matches the fix done on intel iommu in commit:
a2e1cd41ccfe796529abfd1b6aeb1dd4393762a2

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20200226172628.17449-1-eric.auger@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 hw/arm/smmu-common.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index 0f2573f004..67d7b2d0fd 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -301,6 +301,7 @@ SMMUPciBus *smmu_find_smmu_pcibus(SMMUState *s, uint8_t bus_num)
                 return smmu_pci_bus;
             }
         }
+        smmu_pci_bus = NULL;
     }
     return smmu_pci_bus;
 }
-- 
2.21.1