Issue #1531: Read fileobj from the current offset, do not seek to
the start.

(backport from r59260)
diff --git a/Misc/NEWS b/Misc/NEWS
index 2c9f5fd..7172f83 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -46,6 +46,9 @@
 Library
 -------
 
+- Issue #1531: tarfile.py: Read fileobj from the current offset, do not
+  seek to the start.
+
 - Issue 1429818: patch for trace and doctest modules so they play nicely
   together.