pci: clean up of pci_init_wmask().

This patch replaces for loop by memset in pci_init_wmask().
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/pci.c

@@ -426,15 +426,15 @@ static void pci_init_cmask(PCIDevice *dev)
 
 static void pci_init_wmask(PCIDevice *dev)
 {
-    int i;
     int config_size = pci_config_size(dev);
 
     dev->wmask[PCI_CACHE_LINE_SIZE] = 0xff;
     dev->wmask[PCI_INTERRUPT_LINE] = 0xff;
     pci_set_word(dev->wmask + PCI_COMMAND,
                  PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
-    for (i = PCI_CONFIG_HEADER_SIZE; i < config_size; ++i)
-        dev->wmask[i] = 0xff;
+
+    memset(dev->wmask + PCI_CONFIG_HEADER_SIZE, 0xff,
+           config_size - PCI_CONFIG_HEADER_SIZE);
 }
 
 static void pci_init_wmask_bridge(PCIDevice *d)