PcAtChipsetPkg/PcRtc: Add assertion to pass static code checker

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Shumin Qiu <Shumin.Qiu@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19514 6f19259b-4bc3-4df7-8a09-765794883524

PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c

@@ -1277,6 +1277,8 @@ PcRtcAcpiTableChangeCallback (
     return;
   }
 
+  ASSERT (Rsdp != NULL);
+
   //
   // Find FADT in XSDT
   //