IMA: use current_cred() instead of current->cred

Proper invocation of the current credentials is to use current_cred() not
current->cred.  This patches makes IMA use the new method.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/integrity/ima/ima_audit.c b/security/integrity/ima/ima_audit.c
index b628eea..ff513ff 100644
--- a/security/integrity/ima/ima_audit.c
+++ b/security/integrity/ima/ima_audit.c
@@ -41,7 +41,7 @@
 
 	ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
 	audit_log_format(ab, "integrity: pid=%d uid=%u auid=%u ses=%u",
-			 current->pid, current->cred->uid,
+			 current->pid, current_cred()->uid,
 			 audit_get_loginuid(current),
 			 audit_get_sessionid(current));
 	audit_log_task_context(ab);