P2P: Fix stopping on search after SD callback

P2P: Fix stopping on search after SD callback

If p2p_find_timeout triggers after starting SD but before getting TX
status for send action, unwanted search could get triggered again when
TX status arrives though p2p_find_timeout moved the state to P2P_IDLE by
then. p2p_continue_find() would then move the state to P2P_SEARCH again.
Do not trigger the find operation from this context if state is
P2P_IDLE to avoid this.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>