Remove warning in printf due to type mismatch

```-8<----
qemu/target-lm32/translate.c: In function ‘gen_intermediate_code_internal’:
qemu/target-lm32/translate.c:1135: warning: format ‘%zd’ expects type ‘signed size_t’, but argument 4 has type ‘int’
```

-8<----

Both gen_opc_ptr and gen_opc_buf are "uint16_t *". The difference between
pointers is a ptrdiff_t so printf needs '%td'.
Signed-off-by: NAlexandre Raymond <cerbere@gmail.com>
Acked-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NAndreas Färber <andreas.faerber@web.de>

target-lm32/translate.c

@@ -1132,7 +1132,7 @@ static void gen_intermediate_code_internal(CPUState *env,
     if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
         qemu_log("\n");
         log_target_disas(pc_start, dc->pc - pc_start, 0);
-        qemu_log("\nisize=%d osize=%zd\n",
+        qemu_log("\nisize=%d osize=%td\n",
             dc->pc - pc_start, gen_opc_ptr - gen_opc_buf);
     }
 #endif