CRED: Wrap task credential accesses in the AX25 protocol

Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-hams@vger.kernel.org
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/net/ax25/ax25_route.c b/net/ax25/ax25_route.c
index 8672cd8..c833ba4 100644
--- a/net/ax25/ax25_route.c
+++ b/net/ax25/ax25_route.c
@@ -421,7 +421,7 @@
 		goto put;
 	}
 
-	user = ax25_findbyuid(current->euid);
+	user = ax25_findbyuid(current_euid());
 	if (user) {
 		ax25->source_addr = user->call;
 		ax25_uid_put(user);