KVM: MMU: remove unnecessary NX check in walk_addr

After is_rsvd_bits_set() checks, EFER.NXE must be enabled if NX bit is seted

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/paging_tmpl.h

@@ -170,7 +170,7 @@ walk:
 			goto access_error;
 
 #if PTTYPE == 64
-		if (fetch_fault && is_nx(vcpu) && (pte & PT64_NX_MASK))
+		if (fetch_fault && (pte & PT64_NX_MASK))
 			goto access_error;
 #endif