hw/watchdog/wdt_i6300esb: remove a unnecessary comment

The registered memory region of i6300esb is not suitable for coalesced
mmio, because a write for the region may trigger an immediate action
and can't be delayed.
Signed-off-by: NPeng Hao <peng.hao2@zte.com.cn>
Message-Id: <1544253511-82742-1-git-send-email-peng.hao2@zte.com.cn>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/watchdog/wdt_i6300esb.c

@@ -449,7 +449,6 @@ static void i6300esb_realize(PCIDevice *dev, Error **errp)
     memory_region_init_io(&d->io_mem, OBJECT(d), &i6300esb_ops, d,
                           "i6300esb", 0x10);
     pci_register_bar(&d->dev, 0, 0, &d->io_mem);
-    /* qemu_register_coalesced_mmio (addr, 0x10); ? */
 }
 
 static void i6300esb_exit(PCIDevice *dev)