we don't support ancient cffi any more

Author: reaperhulk

src/OpenSSL/_util.py

@@ -155,15 +155,4 @@ def text_to_bytes_and_warn(label, obj):
     return obj
 
 
-try:
-    # newer versions of cffi free the buffer deterministically
-    with ffi.from_buffer(b""):
-        pass
-    from_buffer = ffi.from_buffer
-except AttributeError:
-    # cffi < 0.12 frees the buffer with refcounting gc
-    from contextlib import contextmanager
-
-    @contextmanager
-    def from_buffer(*args):
-        yield ffi.from_buffer(*args)
+from_buffer = ffi.from_buffer