Revert "[PATCH] namespaces: fix exit race by splitting exit"

This reverts commit 7a238fcba0629b6f2edbcd37458bae56fcf36be5 in
preparation for a better and simpler fix proposed by Eric Biederman
(and fixed up by Serge Hallyn)

Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/fork.c b/kernel/fork.c
index 4cf8684..fc723e5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1265,7 +1265,7 @@
 	return p;
 
 bad_fork_cleanup_namespaces:
-	put_and_finalize_nsproxy(p->nsproxy);
+	exit_task_namespaces(p);
 bad_fork_cleanup_keys:
 	exit_keys(p);
 bad_fork_cleanup_mm:
@@ -1711,7 +1711,7 @@
 	}
 
 	if (new_nsproxy)
-		put_and_finalize_nsproxy(new_nsproxy);
+		put_nsproxy(new_nsproxy);
 
 bad_unshare_cleanup_ipc:
 	if (new_ipc)