# HG changeset patch
# User Matt Harbison <matt_harbison@yahoo.com>
# Date 2021-09-20 14:46:35
# Node ID ae79611e3115c18cd3c213b656847b4e2b0547e2
# Parent  94d4a3f78e995eb1e3234154c5e3b29210360340

util: avoid a name-error warning in the `mmapread` exception handler

Newly caught by pytype 2021-09-09.

    File "/mnt/c/Users/Matt/hg/mercurial/util.py", line 458, in mmapread: Name 'fd' is not defined [name-error]

Differential Revision: https://phab.mercurial-scm.org/D11470

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -449,8 +449,8 @@ def mmapread(fp, size=None):
         return b''
     elif size is None:
         size = 0
+    fd = getattr(fp, 'fileno', lambda: fp)()
     try:
-        fd = getattr(fp, 'fileno', lambda: fp)()
         return mmap.mmap(fd, size, access=mmap.ACCESS_READ)
     except ValueError:
         # Empty files cannot be mmapped, but mmapread should still work.  Check