* hppa-tdep.h (hppa_frame_prev_register_helper): Change types of

last argument to `gdb_byte *'.
* hppa-tdep.c (hppa32_convert_from_func_ptr_addr): Rewrite.
(hppa_frame_prev_register_helper): Change types of last argument
to `gdb_byte *'.
* hppa-hpux-tdep.c (hppa_hpux_sigtramp_frame_prev_register):
Change types of last argument to `gdb_byte *'.