top: fix the bug affecting certain Find/Locate results

When 'Other Filtering' was introduced the idea of what
constituted a displayed row changed. No longer was any
call to task_show assured of consuming one screen row.
Now the determining factor was whether or not the rows
were empty. This worked Ok until a certain Find string
was active then the entire display could be corrupted.

With Find active, the task_show() function alters each
returned row while highlighting each visible match. If
the search was on a single byte value & matched at the
beginning of a row the match got overwritten with '\0'
which then appears empty upon return to window_show().
So that row would not be counted as having been shown.

This was best illustrated with a Find on a single ' '.

This patch will restore proper 'Find/Locate' behavior.

Reference(s):
commit 5edc6fb3174f1fd02bbfca61ec6d8a3a2e12f71c

Signed-off-by: Jim Warner <james.warner@comcast.net>

top/top.c

@@ -5192,6 +5192,8 @@ static const char *task_show (const WIN_t *q, const proc_t *p) {
             ofs = find_ofs(q, row);
          } while (-1 < ofs);
          PUTT("%s%s", row, Caps_endline);
+         // with a corrupted rbuf, ensure row is 'counted' by window_show
+         rbuf[0] = '!';
       } else
          PUFF("\n%s%s%s", cap, row, Caps_endline);
    }