virpcitest: Separate two functions properly

There is a missing empty line between two functions since its
introduction in v1.2.0-rc1~150.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

tests/virpcimock.c

@@ -696,6 +696,7 @@ pci_driver_handle_unbind(const char *path)
  cleanup:
     return ret;
 }
+
 static int
 pci_driver_handle_new_id(const char *path)
 {