utils.py: Fix lockfile retry handling

The lockfile retry parameter is expected to return immediately after
attempting to take the lock. There was a bug in the logic which this
patch fixed to ensure it does that.

(Bitbake rev: f421ef819f00ac659504d9af41bcc8323422ff8c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/utils.py

@@ -443,7 +443,7 @@ def lockfile(name, shared=False, retry=True):
                     return lf
             lf.close()
         except Exception:
-            continue
+            pass
         if not retry:
             return None