qemu_domain: Separate NVRAM VAR store file name generation

Move the code that (possibly) generates filename of NVRAM VAR
store into a single function so that it can be re-used later.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NLaszlo Ersek <lersek@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/qemu/qemu_domain.c

@@ -3894,14 +3894,8 @@ qemuDomainDefPostParse(virDomainDefPtr def,
         goto cleanup;
     }
 
-    if (def->os.loader &&
-        def->os.loader->type == VIR_DOMAIN_LOADER_TYPE_PFLASH &&
-        def->os.loader->readonly == VIR_TRISTATE_SWITCH_ON &&
-        !def->os.loader->nvram) {
-        if (virAsprintf(&def->os.loader->nvram, "%s/%s_VARS.fd",
-                        cfg->nvramDir, def->name) < 0)
-            goto cleanup;
-    }
+    if (qemuDomainNVRAMPathGenerate(cfg, def) < 0)
+        goto cleanup;
 
     if (qemuDomainDefAddDefaultDevices(def, qemuCaps) < 0)
         goto cleanup;
@@ -14023,3 +14017,19 @@ qemuDomainDiskIsMissingLocalOptional(virDomainDiskDefPtr disk)
            virStorageSourceIsLocalStorage(disk->src) && disk->src->path &&
            !virFileExists(disk->src->path);
 }
+
+
+int
+qemuDomainNVRAMPathGenerate(virQEMUDriverConfigPtr cfg,
+                            virDomainDefPtr def)
+{
+    if (def->os.loader &&
+        def->os.loader->type == VIR_DOMAIN_LOADER_TYPE_PFLASH &&
+        def->os.loader->readonly == VIR_TRISTATE_SWITCH_ON &&
+        !def->os.loader->nvram) {
+        return virAsprintf(&def->os.loader->nvram, "%s/%s_VARS.fd",
+                           cfg->nvramDir, def->name);
+    }
+
+    return 0;
+}

src/qemu/qemu_domain.h

@@ -1107,4 +1107,8 @@ qemuDomainIsUsingNoShutdown(qemuDomainObjPrivatePtr priv);
 bool
 qemuDomainDiskIsMissingLocalOptional(virDomainDiskDefPtr disk);
 
+int
+qemuDomainNVRAMPathGenerate(virQEMUDriverConfigPtr cfg,
+                            virDomainDefPtr def);
+
 #endif /* LIBVIRT_QEMU_DOMAIN_H */