nvme-core: remove repeated wq flags

In nvme_core_init() nvme_wq, nvme_reset_wq, nvme_delete_wq share same
flags :- WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS.

Insated of repeating these flags in each call use the common variable.

Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/core.c

@@ -5009,22 +5009,20 @@ static inline void _nvme_check_size(void)
 
 static int __init nvme_core_init(void)
 {
+	unsigned int wq_flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS;
 	int result = -ENOMEM;
 
 	_nvme_check_size();
 
-	nvme_wq = alloc_workqueue("nvme-wq",
-			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
+	nvme_wq = alloc_workqueue("nvme-wq", wq_flags, 0);
 	if (!nvme_wq)
 		goto out;
 
-	nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
-			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
+	nvme_reset_wq = alloc_workqueue("nvme-reset-wq", wq_flags, 0);
 	if (!nvme_reset_wq)
 		goto destroy_wq;
 
-	nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
-			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
+	nvme_delete_wq = alloc_workqueue("nvme-delete-wq", wq_flags, 0);
 	if (!nvme_delete_wq)
 		goto destroy_reset_wq;