Don't write to inferior_ptid in aix-thread.c

There are other writes in the file, but they seem more harmless.  This
one is changing the current thread permanently.

Untested.

gdb/ChangeLog:
yyyy-mm-dd  Pedro Alves  <palves@redhat.com>

	* aix-thread.c (pd_update): Use switch_to_thread.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/aix-thread.c b/gdb/aix-thread.c
index f2bd05fef22..3963a08c840 100644
--- a/gdb/aix-thread.c
+++ b/gdb/aix-thread.c
@@ -902,7 +902,7 @@ pd_update (int set_infpid)
     {
       ptid = thread->ptid;
       if (set_infpid)
-	inferior_ptid = ptid;
+	switch_to_thread (thread);
     }
   return ptid;
 }