[openSUSE] block: Take the graph lock in bdrv_snapshot_list (bsc#1211…

…000)

This function has up until now always ran in the main loop, outside of
a coroutine. We're about to make it run inside a coroutine so start
actually taking the graph lock.

Link: https://lore.kernel.org/r/[email protected]
References: bsc#1211000
Signed-off-by: Fabiano Rosas <[email protected]>
Signed-off-by: Dario Faggioli <[email protected]>

block/snapshot.c

@@ -389,7 +389,7 @@ int bdrv_snapshot_list(BlockDriverState *bs,
                        QEMUSnapshotInfo **psn_info)
 {
     GLOBAL_STATE_CODE();
-    GRAPH_RDLOCK_GUARD_MAINLOOP();
+    GRAPH_RDLOCK_GUARD();
 
     BlockDriver *drv = bs->drv;
     BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs);