This function returns None when it doesn't find a match; do that
explicitly.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qmp/qmp-shell | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/scripts/qmp/qmp-shell b/scripts/qmp/qmp-shell
index ea6a87e0b3..8d84467b53 100755
--- a/scripts/qmp/qmp-shell
+++ b/scripts/qmp/qmp-shell
@@ -83,10 +83,10 @@ class QMPCompleter(list):
     def complete(self, text, state):
         for cmd in self:
             if cmd.startswith(text):
-                if not state:
+                if state == 0:
                     return cmd
-                else:
-                    state -= 1
+                state -= 1
+        return None
 
 
 class QMPShellError(Exception):
-- 
2.31.1