Current error message:

 qemu-system-x86_64: -chardev spice,id=foo: Parameter 'driver' expects an abstract device type

while in fact the meaning is in reverse, -chardev expects
a non-abstract device type.

Fixes: 777357d758d9 ("chardev: qom-ify" 2016-12-07)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
(cherry picked from commit 4ad87cd4b2254197b7ac12e3da824854e6a90f8f)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/chardev/char.c b/chardev/char.c
index 996a024c7a..119b548784 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -518,7 +518,7 @@ static const ChardevClass *char_get_class(const char *driver, Error **errp)
 
     if (object_class_is_abstract(oc)) {
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
-                   "an abstract device type");
+                   "a non-abstract device type");
         return NULL;
     }
 
-- 
2.39.2