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Don't write to inferior_ptid in fork-child.c

This is no longer necessary. All targets that call fork_inferior now
also call switch_to_thread as soon as they add the main thread.

gdb/ChangeLog:
2020-06-18 Pedro Alves <palves@redhat.com>

* fork-child.c (postfork_hook): Don't write to inferior_ptid.

--- a/gdb/ChangeLog

+++ b/gdb/ChangeLog

		@@ -1,5 +1,9 @@
1	1	2020-06-18 Pedro Alves <palves@redhat.com>
2	2
	3	+ * fork-child.c (postfork_hook): Don't write to inferior_ptid.
	4	+
	5	+2020-06-18 Pedro Alves <palves@redhat.com>
	6	+
3	7	* bsd-kvm.c (bsd_kvm_target_open): Switch to thread after adding
4	8	it, instead of writing to inferior_ptid.
5	9

--- a/gdb/fork-child.c

+++ b/gdb/fork-child.c

		@@ -82,9 +82,6 @@ postfork_hook (pid_t pid)
82	82
83	83	inferior_appeared (inf, pid);
84	84
85		- /* Needed for wait_for_inferior stuff. */
86		- inferior_ptid = ptid_t (pid);
87		-
88	85	gdb_assert (saved_ui != NULL);
89	86	current_ui = saved_ui;
90	87	saved_ui = NULL;