nvme: Remove dead codes in nvme_setup_io_queues()

Execution cannot reach this statement: "nr_io_queues = result;"

Reported-by: Coverity (CID: 166731)
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/nvme/nvme.c b/drivers/nvme/nvme.c
index 59d54eb..1c3519b 100644
--- a/drivers/nvme/nvme.c
+++ b/drivers/nvme/nvme.c
@@ -562,9 +562,6 @@
 	if (result <= 0)
 		return result;
 
-	if (result < nr_io_queues)
-		nr_io_queues = result;
-
 	dev->max_qid = nr_io_queues;
 
 	/* Free previously allocated queues */