target-microblaze: Use %td for ptrdiff_t arguments in debug message

According to ISO/IEC 9899:1999 7.19.6.1,
the correct length modifier for ptrdiff_t is 't', not 'z'.

Cc: Blue Swirl <blauwirbel@gmail.com>
Cc: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

target-microblaze/translate.c

@@ -1516,7 +1516,7 @@ gen_intermediate_code_internal(CPUState *env, TranslationBlock *tb,
 #if DISAS_GNU
         log_target_disas(pc_start, dc->pc - pc_start, 0);
 #endif
-        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