diff --git a/block.c b/block.c
index cb670fd..d06dd51 100644
--- a/block.c
+++ b/block.c
@@ -2246,7 +2246,7 @@
 
     if (!drv)
         return -ENOMEDIUM;
-    
+
     if (!bs->backing_hd) {
         return -ENOTSUP;
     }