c3-lang/libffi

diff --git a/generate-darwin-source-and-headers.py b/generate-darwin-source-and-headers.py
index f551c35..005537f 100644
--- a/generate-darwin-source-and-headers.py
+++ b/generate-darwin-source-and-headers.py
@@ -91,9 +91,7 @@ def mkdir_p(path):
     try:
         os.makedirs(path)
     except OSError as exc:  # Python >2.5
-        if exc.errno == errno.EEXIST:
-            pass
-        else:
+        if exc.errno != errno.EEXIST:
             raise