[PATCH COMMITTED] scripts/glibcelf.py: Properly report <elf.h> parsing failures

[Florian Weimer <fweimer@redhat.com>]

Without this change, parse failures result in an exception:

Traceback (most recent call last):
  File "tst-glibcelf.py", line 23, in <module>
    import glibcelf
  File "/path/to/git/scripts/glibcelf.py", line 226, in <module>
    _elf_h = _parse_elf_h()
  File "/path/to/git/scripts/glibcelf.py", line 221, in _parse_elf_h
    result = glibcpp.macro_eval(glibcpp.macro_definitions(tokens), reporter)
  File "/path/to/git/scripts/glibcpp.py", line 379, in macro_eval
    reporter.error(md.line, 'macro {} redefined'.format(md.name))
  File "/path/to/git/scripts/glibcelf.py", line 214, in error
    errors += 1
UnboundLocalError: local variable 'errors' referenced before assignment

---
 scripts/glibcelf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/glibcelf.py b/scripts/glibcelf.py
index 420cb21943..59aab56ecf 100644
--- a/scripts/glibcelf.py
+++ b/scripts/glibcelf.py
@@ -211,7 +211,7 @@ def _parse_elf_h():
             self.errors = 0
 
         def error(self, line, message):
-            errors += 1
+            self.errors += 1
             print('{}:{}: error: {}'.format(path, line, message))
 
         def note(self, line, message):

base-commit: ee1ada1bdb8074de6e1bdc956ab19aef7b6a7872