KVM: x86: Replace X86_FEATURE_NX offset with the definition

Replace reference to X86_FEATURE_NX using bit shift with the defined
X86_FEATURE_NX.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 38a0afe..f4bad87 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -112,8 +112,8 @@
 			break;
 		}
 	}
-	if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
-		entry->edx &= ~(1 << 20);
+	if (entry && (entry->edx & bit(X86_FEATURE_NX)) && !is_efer_nx()) {
+		entry->edx &= ~bit(X86_FEATURE_NX);
 		printk(KERN_INFO "kvm: guest NX capability removed\n");
 	}
 }