SecurityPkg OpalPasswordDxe: Return directly if no any device

Return directly if no any device in EndOfDxe notification.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
(cherry picked from commit fbe1328a51)

SecurityPkg/Tcg/Opal/OpalPassword/OpalDriver.c

@@ -610,6 +610,14 @@ OpalEndOfDxeEventNotify (
     mOpalRequestVariableSize = 0;
   }
 
+  //
+  // If no any device, return directly.
+  //
+  if (mOpalDriver.DeviceList == NULL) {
+    gBS->CloseEvent (Event);
+    return;
+  }
+
   //
   // Assume 64K size and alignment are enough.
   //