blkdebug: Fix set_state_opts definition

The list head was initialized to point to the wrong list, so all actions ended
up being handled as inject-error even if they were set-state in fact.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

block/blkdebug.c

@@ -111,7 +111,7 @@ static QemuOptsList inject_error_opts = {
 
 static QemuOptsList set_state_opts = {
     .name = "set-state",
-    .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head),
+    .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head),
     .desc = {
         {
             .name = "event",