[Hurd/gnu-nat] Fix old "signal-thread" command regression.

By inspection, I noticed that when I made the gnu-nat use
ptid(pid,0,tid) to represent a thread, instead of using ptid(tid,0,0),
in <https://sourceware.org/ml/gdb-patches/2008-08/msg00175.html>, I
introduced a bug.

The change was:

   else
     {
-      int tid = PIDGET (thread_id_to_pid (atoi (args)));
+      int tid = ptid_get_tid (thread_id_to_pid (atoi (args)));
       if (tid < 0)
 	error (_("Thread ID %s not known.  Use the \"info threads\" command to\n"
 	       "see the IDs of currently known threads."), args);

and thread_id_to_pid does:

 ptid_t
 thread_id_to_pid (int num)
 {
   struct thread_info *thread = find_thread_id (num);

   if (thread)
     return thread->ptid;
   else
     return pid_to_ptid (-1);
 }

(pid_to_ptid (-1) is the same as minus_one_ptid.)

So before, we were really looking at the pid, where thread_id_to_pid
stores the -1.

The right fix is to compare the whole ptid to minus_one_ptid, of
course.

Completely untested, but I think it's obvious enough, so I went ahead
and put it in.

gdb/
2013-09-18  Pedro Alves  <palves@redhat.com>

	* gnu-nat.c (set_sig_thread_cmd): Compare the thread's ptid to
	minus_one_ptid instead of looking at the ptid's tid field and
	comparing that to -1.

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2013-09-18  Pedro Alves  <palves@redhat.com>
+
+	* gnu-nat.c (set_sig_thread_cmd): Compare the thread's ptid to
+	minus_one_ptid instead of looking at the ptid's tid field and
+	comparing that to -1.
+
 2013-09-18  Andrew Burgess  <aburgess@broadcom.com>
 
 	* main.h (get_gdb_program_name): Remove extra whitespace.

gdb/gnu-nat.c

@@ -2922,13 +2922,13 @@ set_sig_thread_cmd (char *args, int from_tty)
     inf->signal_thread = 0;
   else
     {
-      int tid = ptid_get_tid (thread_id_to_pid (atoi (args)));
+      ptid_t ptid = thread_id_to_pid (atoi (args));
 
-      if (tid < 0)
+      if (ptid_equal (ptid, minus_one_ptid))
 	error (_("Thread ID %s not known.  "
 		 "Use the \"info threads\" command to\n"
 	       "see the IDs of currently known threads."), args);
-      inf->signal_thread = inf_tid_to_thread (inf, tid);
+      inf->signal_thread = inf_tid_to_thread (inf, ptid_get_tid (ptid));
     }
 }