memory leak fixes

Author: stuartcarnie

library.c

@@ -2223,6 +2223,7 @@ redis_read_variant_bulk(RedisSock *redis_sock, int size, zval **z_ret
 		return -1;
 	} else {
 		ZVAL_STRINGL(*z_ret, bulk_resp, size);
+		efree(bulk_resp);
 		return 0;
 	}
 }

redis.c

@@ -3129,7 +3129,7 @@ redis_build_eval_cmd(RedisSock *redis_sock, char **ret, char *keyword,
                 if(key_free) efree(key);
 
                 // Free our temporary arg if we created one
-                if(Z_TYPE(z_tmp) == IS_UNDEF) {
+                if(!Z_ISUNDEF(z_tmp)) {
                     zval_dtor(&z_tmp);
                 }
             }