CRED: Missing put_cred() in prepare_kernel_cred()

Missing put_cred() in the error handling path of prepare_kernel_cred().

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/cred.c b/kernel/cred.c
index ff7bc07..fc222e4a 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -529,6 +529,7 @@
 
 error:
 	put_cred(new);
+	put_cred(old);
 	return NULL;
 }
 EXPORT_SYMBOL(prepare_kernel_cred);