* fhandler.h (fhandler_process::p): New field.

(fhandler_process:fill_filebuf): Revert to same definition as virtual in parent
class.
(fhandler_process::open): Fill out p field rather than passing as an argument.
(fhandler_process::fill_filebuf): Use p pointer rather than argument.

winsup/cygwin/fhandler.h

@@ -1128,13 +1128,14 @@ class fhandler_registry: public fhandler_proc
 struct _pinfo;
 class fhandler_process: public fhandler_proc
 {
+  pinfo *p;
  public:
   fhandler_process ();
   int exists();
   struct dirent *readdir (DIR *);
   int open (path_conv *real_path, int flags, mode_t mode = 0);
   int __stdcall fstat (struct __stat64 *buf, path_conv *) __attribute__ ((regparm (3)));
-  void fill_filebuf (pinfo& p);
+  void fill_filebuf ();
 };
 
 typedef union