hostmem: drop error variable from host_memory_backend_get_memory()

Unused, so let's remove it.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180619134141.29478-8-david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/numa.c b/numa.c
index 33572bf..94f758c 100644
--- a/numa.c
+++ b/numa.c
@@ -523,8 +523,7 @@
         if (!backend) {
             continue;
         }
-        MemoryRegion *seg = host_memory_backend_get_memory(backend,
-                                                           &error_fatal);
+        MemoryRegion *seg = host_memory_backend_get_memory(backend);
 
         if (memory_region_is_mapped(seg)) {
             char *path = object_get_canonical_path_component(OBJECT(backend));