KVM: x86/mmu: Remove redundant is_tdp_mmu_root check

The check for is_tdp_mmu_root in kvm_tdp_mmu_map is redundant because
kvm_tdp_mmu_map's only caller (direct_page_fault) already checks
is_tdp_mmu_root.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20210617231948.2591431-2-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/tdp_mmu.c

@@ -985,8 +985,6 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 
 	if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
 		return RET_PF_RETRY;
-	if (WARN_ON(!is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa)))
-		return RET_PF_RETRY;
 
 	level = kvm_mmu_hugepage_adjust(vcpu, gfn, max_level, &pfn,
 					huge_page_disallowed, &req_level);