[commit] fix compilation error in hppa-tdep.c (hppa_pop_frame)

[Joel Brobecker]

> Oops, thanks!  What are the odds of getting --target=hppa-elf (a minimal 
> hppa target) building?  That should stop me breaking the HPPA in this way.

The odds at the moment are very small, at least because of the following
includes in hppa-tdep.c (I think):

        #ifdef USG
        #include <sys/types.h>
        #endif
        
        #include <dl.h>
        #include <sys/param.h>
        #include <signal.h>
        
        #include <sys/ptrace.h>
        #include <machine/save_state.h>

(etc)

I plan on working on these after having done the minimal work to be done
with the conversion. In the meantime, I won't complain about anybody
breaking hppa by mistake (I would not complain anyway, actually).

-- 
Joel