ShellPkg: Refine code style to avoid potential NullPointer dereference.

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



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16161 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellLevel2CommandsLib/Cp.c

@@ -328,6 +328,8 @@ ValidateAndCopyFiles(
     }
   }
   
+  ASSERT (CleanFilePathStr != NULL);
+
   //
   // If we are trying to copy multiple files... make sure we got a directory for the target...
   //

ShellPkg/Library/UefiShellLevel2CommandsLib/Mv.c

@@ -289,6 +289,8 @@ ValidateAndMoveFiles(
     }
   }  
 
+  ASSERT (CleanFilePathStr != NULL);
+
   //
   // Get and validate the destination location
   //