style(db/declarative): simplify the logic of load_into_cache (#11384)

kong/db/declarative/import.lua

@@ -453,47 +453,47 @@ do
     local reconfigure_data
 
     local ok, err, default_ws = load_into_cache(entities, meta, hash)
-    if ok then
-      local router_hash
-      local plugins_hash
-      local balancer_hash
-      if hashes then
-        if hashes.routes ~= DECLARATIVE_EMPTY_CONFIG_HASH then
-          router_hash = md5(hashes.services .. hashes.routes)
-        else
-          router_hash = DECLARATIVE_EMPTY_CONFIG_HASH
-        end
-
-        plugins_hash = hashes.plugins
+    if not ok then
+      if err:find("MDB_MAP_FULL", nil, true) then
+        return nil, "map full"
+      end
 
-        local upstreams_hash = hashes.upstreams
-        local targets_hash   = hashes.targets
-        if upstreams_hash ~= DECLARATIVE_EMPTY_CONFIG_HASH or
-           targets_hash   ~= DECLARATIVE_EMPTY_CONFIG_HASH
-        then
-          balancer_hash = md5(upstreams_hash .. targets_hash)
+      return nil, err
+    end
 
-        else
-          balancer_hash = DECLARATIVE_EMPTY_CONFIG_HASH
-        end
+    local router_hash
+    local plugins_hash
+    local balancer_hash
+    if hashes then
+      if hashes.routes ~= DECLARATIVE_EMPTY_CONFIG_HASH then
+        router_hash = md5(hashes.services .. hashes.routes)
+      else
+        router_hash = DECLARATIVE_EMPTY_CONFIG_HASH
       end
 
-      reconfigure_data = {
-        default_ws,
-        router_hash,
-        plugins_hash,
-        balancer_hash,
-      }
+      plugins_hash = hashes.plugins
 
-      ok, err = events.declarative_reconfigure_notify(reconfigure_data)
-      if not ok then
-        return nil, err
+      local upstreams_hash = hashes.upstreams
+      local targets_hash   = hashes.targets
+      if upstreams_hash ~= DECLARATIVE_EMPTY_CONFIG_HASH or
+         targets_hash   ~= DECLARATIVE_EMPTY_CONFIG_HASH
+      then
+        balancer_hash = md5(upstreams_hash .. targets_hash)
+
+      else
+        balancer_hash = DECLARATIVE_EMPTY_CONFIG_HASH
       end
+    end
 
-    elseif err:find("MDB_MAP_FULL", nil, true) then
-      return nil, "map full"
+    reconfigure_data = {
+      default_ws,
+      router_hash,
+      plugins_hash,
+      balancer_hash,
+    }
 
-    else
+    ok, err = events.declarative_reconfigure_notify(reconfigure_data)
+    if not ok then
       return nil, err
     end