i3c: master: Update hot-join flag only on success

i3c: master: Update hot-join flag only on success

To prevent inconsistent state when an error occurs, ensure the hot-join
flag is updated only when enabling or disabling hot-join succeeds.

Fixes: 317bacf960a48 ("i3c: master: add enable(disable) hot join in sys entry")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260113072702.16268-4-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>