Fix bug in exception handling for hardlink clone

mercurial/commands.py

@@ -436,7 +436,7 b' def clone(ui, source, dest=None, **opts)'
                       copyfile)
         try:
             os.unlink(os.path.join(dest, ".hg", "dirstate"))
-        except IOError:
+        except OSError:
             pass
 
         repo = hg.repository(ui, dest)