qemu: Remove duplicated code in qemuBuildSerialChrDeviceStr()

The call to qemuBuildDeviceAddressStr() happens no matter
what, so we can move it to the outer possible scope inside
the function.

We can also move the call to virBufferAsprintf() after all
the checks have been performed, where it makes more sense.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_command.c

@@ -10134,14 +10134,8 @@ qemuBuildSerialChrDeviceStr(char **deviceStr,
             serial->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_SPAPRVIO) {
             virBufferAsprintf(&cmd, "spapr-vty,chardev=char%s",
                               serial->info.alias);
-            if (qemuBuildDeviceAddressStr(&cmd, def, &serial->info, qemuCaps) < 0)
-                goto error;
         }
     } else {
-        virBufferAsprintf(&cmd, "%s,chardev=char%s,id=%s",
-                          virDomainChrSerialTargetTypeToString(serial->targetType),
-                          serial->info.alias, serial->info.alias);
-
         switch (serial->targetType) {
         case VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_USB:
             if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_USB_SERIAL)) {
@@ -10156,9 +10150,6 @@ qemuBuildSerialChrDeviceStr(char **deviceStr,
                                _("usb-serial requires address of usb type"));
                 goto error;
             }
-
-            if (qemuBuildDeviceAddressStr(&cmd, def, &serial->info, qemuCaps) < 0)
-                goto error;
             break;
 
         case VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_ISA:
@@ -10168,9 +10159,6 @@ qemuBuildSerialChrDeviceStr(char **deviceStr,
                                _("isa-serial requires address of isa type"));
                 goto error;
             }
-
-            if (qemuBuildDeviceAddressStr(&cmd, def, &serial->info, qemuCaps) < 0)
-                goto error;
             break;
 
         case VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_PCI:
@@ -10186,13 +10174,17 @@ qemuBuildSerialChrDeviceStr(char **deviceStr,
                                _("pci-serial requires address of pci type"));
                 goto error;
             }
-
-            if (qemuBuildDeviceAddressStr(&cmd, def, &serial->info, qemuCaps) < 0)
-                goto error;
             break;
         }
+
+        virBufferAsprintf(&cmd, "%s,chardev=char%s,id=%s",
+                          virDomainChrSerialTargetTypeToString(serial->targetType),
+                          serial->info.alias, serial->info.alias);
     }
 
+    if (qemuBuildDeviceAddressStr(&cmd, def, &serial->info, qemuCaps) < 0)
+        goto error;
+
     if (virBufferCheckError(&cmd) < 0)
         goto error;