[meld] filediff: Stop using buffer builtin name

[Kai Willadsen <kaiw src gnome org>]

commit 354979a49691d54190dc856b7a1d9f4f4cfe1f61
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Jul 31 08:03:45 2016 +1000

    filediff: Stop using buffer builtin name

 meld/filediff.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index 89daf41..20ad86d 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -748,9 +748,9 @@ class FileDiff(melddoc.MeldDoc, gnomeglade.Component):
         self._set_merge_action_sensitivity()
         self._set_external_action_sensitivity()
 
-    def _after_text_modified(self, buffer, startline, sizechange):
+    def _after_text_modified(self, buf, startline, sizechange):
         if self.num_panes > 1:
-            pane = self.textbuffer.index(buffer)
+            pane = self.textbuffer.index(buf)
             if not self.linediffer.syncpoints:
                 self.linediffer.change_sequence(pane, startline, sizechange,
                                                 self.buffer_filtered)