Fix memory leak

src/main.c

@@ -206,6 +206,8 @@ int main(int argc, char **argv)
     // Cleanup
     destroy_instruction_information_hashtable(&instruction_informations);
     shash_destroy_hashtable(&label_table);
+    free(target_code.buffer);
+    free(tokens.buffer);
 
     return EXIT_SUCCESS;
 }