[#1015] morph: Resolve funlen linter

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

cmd/frostfs-node/morph.go

@@ -85,6 +85,12 @@ func initMorphComponents(ctx context.Context, c *cfg) {
 		zap.Bool("sidechain_enabled", c.cfgMorph.notaryEnabled),
 	)
 
+	initNetmapSource(c)
+
+	c.cfgMorph.inactivityTimeout = morphconfig.InactivityTimeout(c.appCfg)
+}
+
+func initNetmapSource(c *cfg) {
 	wrap, err := nmClient.NewFromMorph(c.cfgMorph.client, c.cfgNetmap.scriptHash, 0, nmClient.TryNotary())
 	fatalOnErr(err)
 
@@ -105,9 +111,6 @@ func initMorphComponents(ctx context.Context, c *cfg) {
 		// use RPC node as source of netmap (with caching)
 		netmapSource = newCachedNetmapStorage(c.cfgNetmap.state, wrap)
 	}
-
-	c.cfgMorph.inactivityTimeout = morphconfig.InactivityTimeout(c.appCfg)
-
 	c.netMapSource = netmapSource
 	c.cfgNetmap.wrapper = wrap
 }