nandsim: Fix return code testing of ns_find_operation()

ns_find_operation() returns 0 on success.

Fixes: 052a7a53 ("mtd: rawnand: nandsim: Clean error handling")
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200615113404.25447-1-richard@nod.at

drivers/mtd/nand/raw/nandsim.c

@@ -1761,7 +1761,7 @@ static void ns_switch_state(struct nandsim *ns)
 
 		NS_DBG("switch_state: operation is unknown, try to find it\n");
 
-		if (!ns_find_operation(ns, 0))
+		if (ns_find_operation(ns, 0))
 			return;
 
 		if ((ns->state & ACTION_MASK) &&