QError: Improve QERR_QMP_BAD_INPUT_OBJECT desc

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/qerror.c b/qerror.c
index b6aaec7..034c7de 100644
--- a/qerror.c
+++ b/qerror.c
@@ -170,7 +170,7 @@
     },
     {
         .error_fmt = QERR_QMP_BAD_INPUT_OBJECT,
-        .desc      = "Bad QMP input object",
+        .desc      = "Expected '%(expected)' in QMP input",
     },
     {
         .error_fmt = QERR_QMP_BAD_INPUT_OBJECT_MEMBER,