You should declare you are using a global version of a variable before
you attempt to modify it in a function.

Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
---
 tests/guest-debug/test-gdbstub.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/guest-debug/test-gdbstub.py 
b/tests/guest-debug/test-gdbstub.py
index 0e4ac01426..c7e3986a24 100644
--- a/tests/guest-debug/test-gdbstub.py
+++ b/tests/guest-debug/test-gdbstub.py
@@ -16,6 +16,7 @@ def report(cond, msg):
         print ("PASS: %s" % (msg))
     else:
         print ("FAIL: %s" % (msg))
+        global failcount
         failcount += 1
 
 
-- 
2.17.1


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