fix some compiler warnings

gerbview/rs274x.cpp

@@ -758,6 +758,8 @@ bool GERBER_IMAGE::ExecuteRS274XCommand( int       command,
         break;
     }
 
+    (void) seq_len;     // quiet g++, or delete the unused variable.
+
     ok = GetEndOfBlock( buff, text, m_Current_File );
 
     return ok;
@@ -788,6 +790,7 @@ bool GetEndOfBlock( char buff[GERBER_BUFZ], char*& text, FILE* gerber_file )
     return false;
 }
 
+
 /**
  * Function GetNextLine
  * test for an end of line

pcbnew/class_drawsegment.cpp

@@ -320,8 +320,7 @@ void DRAWSEGMENT::GetMsgPanelInfo( std::vector< MSG_PANEL_ITEM >& aList )
     wxString msg;
     wxString coords;
 
-    BOARD*   board = (BOARD*) m_Parent;
-    wxASSERT( board );
+    wxASSERT( m_Parent );
 
     msg = wxT( "DRAWING" );