pci: Replace pci_add_capability2() with pci_add_capability()

After the patch 'Make errp the last parameter of pci_add_capability()',
pci_add_capability() and pci_add_capability2() now do exactly the same.
So drop the wrapper pci_add_capability() of pci_add_capability2(), then
replace the pci_add_capability2() with pci_add_capability() everywhere.

Cc: pbonzini@redhat.com
Cc: rth@twiddle.net
Cc: ehabkost@redhat.com
Cc: mst@redhat.com
Cc: dmitry@daynix.com
Cc: jasowang@redhat.com
Cc: marcel@redhat.com
Cc: alex.williamson@redhat.com
Cc: armbru@redhat.com
Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Mao Zhongyi <maozy.fnst@cn.fujitsu.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/pci/msi.c b/hw/pci/msi.c
index a87b227..5e05ce5 100644
--- a/hw/pci/msi.c
+++ b/hw/pci/msi.c
@@ -216,7 +216,7 @@
     }
 
     cap_size = msi_cap_sizeof(flags);
-    config_offset = pci_add_capability2(dev, PCI_CAP_ID_MSI, offset,
+    config_offset = pci_add_capability(dev, PCI_CAP_ID_MSI, offset,
                                         cap_size, errp);
     if (config_offset < 0) {
         return config_offset;