Fix typo in arguments list to EvalRules().

Also fixes a bug where we weren't clearing the previous tabs from
the notebook.

pcbnew/tools/board_inspection_tool.cpp

@@ -286,9 +286,10 @@ void BOARD_INSPECTION_TOOL::InspectDRCError( const std::shared_ptr<RC_ITEM>& aDR
     }
 
     DIALOG_BOOK_REPORTER* dialog = m_frame->GetInspectDrcErrorDialog();
-
     wxCHECK( dialog, /* void */ );
 
+    dialog->DeleteAllPages();
+
     WX_HTML_REPORT_BOX* r = nullptr;
     bool                compileError = false;
     DRC_ENGINE          drcEngine = makeDRCEngine( &compileError );
@@ -544,7 +545,7 @@ void BOARD_INSPECTION_TOOL::InspectDRCError( const std::shared_ptr<RC_ITEM>& aDR
         }
         else
         {
-            constraint = drcEngine.EvalRules( CLEARANCE_CONSTRAINT, a, a, layer, r );
+            constraint = drcEngine.EvalRules( CLEARANCE_CONSTRAINT, a, b, layer, r );
             clearance = constraint.m_Value.Min();
             clearanceStr = m_frame->StringFromValue( clearance, true );