[PATCH] dm: Correct target_type reference counting

ti->use was only getting incremented the first time a target type was
retrieved (bug introduced by recent hch patch).

drivers/md/dm-target.c

@@ -43,15 +43,16 @@ static struct tt_internal *get_target_type(const char *name)
 	struct tt_internal *ti;
 
 	read_lock(&_lock);
+
 	ti = __find_target_type(name);
-	if (ti && ti->use == 0) {
-		if (try_module_get(ti->tt.module))
-			ti->use++;
-		else
+	if (ti) {
+		if ((ti->use == 0) && !try_module_get(ti->tt.module))
 			ti = NULL;
+		else
+			ti->use++;
 	}
-	read_unlock(&_lock);
 
+	read_unlock(&_lock);
 	return ti;
 }