virtio pmem: remove memdev null check

Coverity reports that when we're assigning vi->size we handle the
"pmem->memdev is NULL" case; but we then pass it into
object_get_canonical_path(), which unconditionally dereferences it
and will crash if it is NULL. If this pointer can be NULL then we
need to do something else here.

We are removing 'pmem->memdev' null check here as memdev will never
be null in this function.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Message-Id: <20190712073554.21918-3-pagupta@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>

hw/virtio/virtio-pmem.c

@@ -134,8 +134,8 @@ static void virtio_pmem_fill_device_info(const VirtIOPMEM *pmem,
                                          VirtioPMEMDeviceInfo *vi)
 {
     vi->memaddr = pmem->start;
-    vi->size = pmem->memdev ? memory_region_size(&pmem->memdev->mr) : 0;
-    vi->memdev = object_get_canonical_path(OBJECT(pmem->memdev));
+    vi->size    = memory_region_size(&pmem->memdev->mr);
+    vi->memdev  = object_get_canonical_path(OBJECT(pmem->memdev));
 }
 
 static MemoryRegion *virtio_pmem_get_memory_region(VirtIOPMEM *pmem,