RssArticle.kt: Modify functions into assigning style

Signed-off-by: 1552980358 <1552980358@qq.com>

app/src/main/java/io/legado/app/data/entities/RssArticle.kt

@@ -20,22 +20,14 @@ data class RssArticle(
     var read: Boolean = false
 ) {
     
-    override fun hashCode(): Int {
+    override fun hashCode() = link.hashCode()
-        return link.hashCode()
-    }
     
     override fun equals(other: Any?): Boolean {
-        if (other == null) {
+        other ?: return false
-            return false
+        return if (other is RssArticle) origin == other.origin && link == other.link else false
-        }
-        if (other is RssArticle) {
-            return origin == other.origin && link == other.link
-        }
-        return false
     }
     
-    fun toStar(): RssStar {
+    fun toStar() = RssStar(
-        return RssStar(
         origin = origin,
         sort = sort,
         title = title,
@@ -47,4 +39,3 @@ data class RssArticle(
         image = image
     )
 }
-}