Update mixr.c to remove uneccessary definitions of variables.

mixr/mixr.c

@@ -613,8 +613,6 @@ void zipr_mixr(void *table_addr)
 		uint64_t b = read_random64() % table_length;
 #else
 		uint64_t a = table_iterator, b = a-1;
-		volatile uint64_t c = read_random64() % table_length;
-		volatile uint64_t d = read_random64() % table_length;
 #endif
 		uint64_t dt_address_a = dt_table_read_entry_address(table_addr, a);
 		uint16_t dt_offset_a = dt_table_read_entry_offset(table_addr, a);