bugfix in fout code

[Zefram <A.Main@xxxxxxxxxxxxxxxxx>]

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I've been getting mysterious core dumps under SunOS for the past couple
of days, starting, coincidentally, just after I installed pre3.  A dump
from a zsh script led to the culprit: SunOS' fflush(), which doesn't
agree with a NULL argument.  In this case it *is* a bug to call fflush
with a NULL argument, so here's the solution:

      Index: Src/jobs.c
      ===================================================================
      RCS file: /home/zefram/usr/cvsroot/zsh/Src/jobs.c,v
      retrieving revision 1.3
      diff -c -r1.3 jobs.c
      *** jobs.c	1996/07/16 14:26:54	1.3
      --- jobs.c	1996/07/17 20:23:37
      ***************
      *** 338,346 ****
        	    putc('\n', fout);
        	    fline = 0;
        	}
      !     } else if (doputnl && interact && !synch)
        	putc('\n', fout);
      !     fflush(fout);
        
        /* print "(pwd now: foo)" messages */
        
      --- 338,348 ----
        	    putc('\n', fout);
        	    fline = 0;
        	}
      ! 	fflush(fout);
      !     } else if (doputnl && interact && !synch) {
        	putc('\n', fout);
      ! 	fflush(fout);
      !     }
        
        /* print "(pwd now: foo)" messages */
        

 -zefram

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