dm mpath: do not call pg_init when it is already running

This patch moves condition checks as a preparation of following
patches and has no effect on behaviour.
process_queued_ios() is the only caller of __pg_init_all_paths()
and 2 condition checks are moved from outside to inside without
side effects.

Signed-off-by: Hannes Reinecke <[e-mail]>
Signed-off-by: Mike Snitzer <[e-mail]>
Reviewed-by: Jun'ichi Nomura <[e-mail]>

drivers/md/dm-mpath.c

···
 	struct pgpath *pgpath;
 	unsigned long pg_init_delay = 0;
 
+	if (m->pg_init_in_progress || m->pg_init_disabled)
+		return;
+
 	m->pg_init_count++;
 	m->pg_init_required = 0;
 	if (m->pg_init_delay_retry)
···
 	    (!pgpath && !m->queue_if_no_path))
 		must_queue = 0;
 
-	if (m->pg_init_required && !m->pg_init_in_progress && pgpath &&
-	    !m->pg_init_disabled)
+	if (pgpath && m->pg_init_required)
 		__pg_init_all_paths(m);
 
 	spin_unlock_irqrestore(&m->lock, flags);