hw/core/qdev-properties-system: Add missing return in set_drive_helper()

Currently, changing the 'drive' property of e.g. a scsi-hd object will
result in an assertion failure if the aio context of the block node
it's replaced with doesn't match the current aio context:

> bdrv_replace_child_noperm: Assertion `bdrv_get_aio_context(old_bs) ==
> bdrv_get_aio_context(new_bs)' failed.

The problematic scenario is already detected, but a 'return' statement
was missing.

Cc: qemu-stable@nongnu.org
Fixes: d1a58c176a ("qdev: allow setting drive property for realized device")
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Message-ID: <20250523070211.280498-1-f.ebner@proxmox.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit eef2dd03f9)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/core/qdev-properties-system.c

@@ -145,6 +145,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
         if (ctx != bdrv_get_aio_context(bs)) {
             error_setg(errp, "Different aio context is not supported for new "
                        "node");
+            return;
         }
 
         blk_replace_bs(blk, bs, errp);