[PATCH] KVM: MMU: fix an IS_ERR() vs NULL bug

[Dan Carpenter <dan.carpenter@oracle.com>]

The alloc_workqueue() function does not return error pointers, it
returns NULL on error.  Update the check accordingly.

Fixes: 1a3320dd2939 ("KVM: MMU: propagate alloc_workqueue failure")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Obviously, I noticed that the patch says "propagate alloc_workqueue
failure" so that's a puzzling thing.  Merge issue perhaps?  In
linux-next it alloc_workqueue() returns NULL.

 arch/x86/kvm/mmu/tdp_mmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index a2f9a34a0168..d71d177ae6b8 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -22,8 +22,8 @@ int kvm_mmu_init_tdp_mmu(struct kvm *kvm)
 		return 0;
 
 	wq = alloc_workqueue("kvm", WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 0);
-	if (IS_ERR(wq))
-		return PTR_ERR(wq);
+	if (!wq)
+		return -ENOMEM;
 
 	/* This should not be changed for the lifetime of the VM. */
 	kvm->arch.tdp_mmu_enabled = true;
-- 
2.20.1