[XEN] Fix cset 13107:04c5f7b71ff4

Signed-off-by: Tim Deegan <Tim.Deegan@xensource.com>

xen/arch/x86/hvm/hvm.c

@@ -371,7 +371,7 @@ void hvm_cpuid(unsigned int input, unsigned int *eax, unsigned int *ebx,
 #endif
             {
                 clear_bit(X86_FEATURE_PAE & 31, edx);
-                clear_bit(X86_FEATURE_CX8, &edx);
+                clear_bit(X86_FEATURE_CX8 & 31, edx);
             }
             clear_bit(X86_FEATURE_PSE36 & 31, edx);
         }