fellow_cache: Pack struct fellow_cache_res

src/fellow_cache.h

@@ -35,17 +35,18 @@ enum fellow_cache_res_e {
 	fcr_allocerr = 1,
 	fcr_ioerr = 2,
 	FCR_LIM
-};
+} __attribute__ ((__packed__));
+
 extern const char * const fellow_cache_res_s[FCR_LIM];
 
 struct fellow_cache_res {
-	enum fellow_cache_res_e status;
 	union {
 		int		integer;
 		void		*ptr;
 		const char	*err;
 	} r;
-};
+	enum fellow_cache_res_e status;
+}  __attribute__ ((__packed__));
 
 struct fellow_cache *
 fellow_cache_init(struct fellow_fd *, buddy_t *, struct stvfe_tune *,