Fix regular expression to match diff output.

This allows some of our presubmit checks that get run only on
modified lines only to continue to function correctly.

At some point, possibly when git was updated, this may have
stopped working.

In particular, this re-enables our OSS linter on publicly visible
files.

Change-Id: I18b25c0dc5693a1aa44d50b95d5570cb8328dba6
diff --git a/presubmit_support.py b/presubmit_support.py
index 0249340..7038132 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -671,7 +671,7 @@
       return []
 
     for line in self.GenerateScmDiff().splitlines():
-      m = re.match(r'^@@ [0-9,+-]+ \+([0-9]+)(?:,[0-9]+)? @@$', line)
+      m = re.match(r'^@@ [0-9,+-]+ \+([0-9]+)(?:,[0-9]+)? @@', line)
       if m:
         line_num = int(m.groups(1)[0])
         continue