[PATCH] blockjob: Fix error message for negative speed

[Kevin Wolf <kwolf@redhat.com>]

The error message for a negative speed uses QERR_INVALID_PARAMETER,
which implies that the 'speed' option doesn't even exist:

    {"error": {"class": "GenericError", "desc": "Invalid parameter 'speed'"}}

Make it use QERR_INVALID_PARAMETER_VALUE instead:

    {"error": {"class": "GenericError", "desc": "Parameter 'speed' expects a non-negative value"}}

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 blockjob.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/blockjob.c b/blockjob.c
index c6e20e2fcd..5d63b1e89d 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -261,7 +261,8 @@ void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
         return;
     }
     if (speed < 0) {
-        error_setg(errp, QERR_INVALID_PARAMETER, "speed");
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "speed",
+                   "a non-negative value");
         return;
     }
 
-- 
2.20.1