virtio: Minor - replace tab characters with space

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/src/hw/virtio-blk.c b/src/hw/virtio-blk.c
index 94485e2..20a79eb 100644
--- a/src/hw/virtio-blk.c
+++ b/src/hw/virtio-blk.c
@@ -211,8 +211,8 @@
     struct pci_device *pci;
     foreachpci(pci) {
         if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET ||
-	    (pci->device != PCI_DEVICE_ID_VIRTIO_BLK_09 &&
-	     pci->device != PCI_DEVICE_ID_VIRTIO_BLK_10))
+            (pci->device != PCI_DEVICE_ID_VIRTIO_BLK_09 &&
+             pci->device != PCI_DEVICE_ID_VIRTIO_BLK_10))
             continue;
         init_virtio_blk(pci);
     }