Fix compiler warning(credit Ramus)

README.md

@@ -53,6 +53,8 @@ Please see the **specific ACPI section of your config.plist**, all SSDTs needed
 * [SSDT AWAC](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl)
 * [SSDT-PMC](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-PMC.dsl)
 
+**AMD:**
+* [SSDT-EC-USBX](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-EC-USBX.dsl)
 
 ### High End Desktop
 

extra-files/SSDT-GPU-SPOOF.dsl

@@ -33,6 +33,10 @@ DefinitionBlock ("", "SSDT", 2, "ACDT", "AMDGPU", 0x00001000)
              DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
              Return (Local0)
            }
+          Else
+          {
+               Return (Zero)
+          }
         }
     }
     Scope (\_SB.PCI0)