diff --git a/vmm/src/vm.rs b/vmm/src/vm.rs
index 0f3e67487..3b831a714 100644
--- a/vmm/src/vm.rs
+++ b/vmm/src/vm.rs
@@ -407,20 +407,16 @@ impl VmmOps for VmOps {
     }
 
     fn mmio_read(&self, gpa: u64, data: &mut [u8]) -> hypervisor::vm::Result<()> {
-        if let Err(e) = self.mmio_bus.read(gpa, data) {
-            if let vm_device::BusError::MissingAddressRange = e {
-                warn!("Guest MMIO read to unregistered address 0x{:x}", gpa);
-            }
+        if let Err(vm_device::BusError::MissingAddressRange) = self.mmio_bus.read(gpa, data) {
+            warn!("Guest MMIO read to unregistered address 0x{:x}", gpa);
         }
         Ok(())
     }
 
     fn mmio_write(&self, gpa: u64, data: &[u8]) -> hypervisor::vm::Result<()> {
         match self.mmio_bus.write(gpa, data) {
-            Err(e) => {
-                if let vm_device::BusError::MissingAddressRange = e {
-                    warn!("Guest MMIO write to unregistered address 0x{:x}", gpa);
-                }
+            Err(vm_device::BusError::MissingAddressRange) => {
+                warn!("Guest MMIO write to unregistered address 0x{:x}", gpa);
             }
             Ok(Some(barrier)) => {
                 info!("Waiting for barrier");
@@ -434,10 +430,8 @@ impl VmmOps for VmOps {
 
     #[cfg(target_arch = "x86_64")]
     fn pio_read(&self, port: u64, data: &mut [u8]) -> hypervisor::vm::Result<()> {
-        if let Err(e) = self.io_bus.read(port, data) {
-            if let vm_device::BusError::MissingAddressRange = e {
-                warn!("Guest PIO read to unregistered address 0x{:x}", port);
-            }
+        if let Err(vm_device::BusError::MissingAddressRange) = self.io_bus.read(port, data) {
+            warn!("Guest PIO read to unregistered address 0x{:x}", port);
         }
         Ok(())
     }
@@ -450,10 +444,8 @@ impl VmmOps for VmOps {
         }
 
         match self.io_bus.write(port, data) {
-            Err(e) => {
-                if let vm_device::BusError::MissingAddressRange = e {
-                    warn!("Guest PIO write to unregistered address 0x{:x}", port);
-                }
+            Err(vm_device::BusError::MissingAddressRange) => {
+                warn!("Guest PIO write to unregistered address 0x{:x}", port);
             }
             Ok(Some(barrier)) => {
                 info!("Waiting for barrier");