gdb/testsuite/
	PR testsuite/12649
	* gdb.mi/mi-dprintf.exp (mi_continue_dprintf) (mi 2nd dprintf): Replace
	$mi_gdb_prompt expectation by mi_expect_stop.
	(mi 1st dprintf, agent, mi 2nd dprintf, agent)
	(mi info dprintf second time): Replace them by mi_send_resuming_command
	and mi_expect_stop.