security/selinux/ss/avtab.c: fix sparse warnings

Index: linux-2.6.11-bk3-sparse/security/selinux/ss/avtab.c
===================================================================
@@ -303,7 +303,7 @@ void avtab_hash_eval(struct avtab *h, ch
 
 int avtab_read_item(void *fp, struct avtab_datum *avdatum, struct avtab_key *avkey)
 {
-	u32 buf[7];
+	__le32 buf[7];
 	u32 items, items2;
 	int rc;
 

@@ -370,7 +370,7 @@ int avtab_read(struct avtab *a, void *fp
 	int rc;
 	struct avtab_key avkey;
 	struct avtab_datum avdatum;
-	u32 buf[1];
+	__le32 buf[1];
 	u32 nel, i;