Deduplicate if_chain method

Author: chansuke

clippy_lints/src/types.rs

@@ -1020,21 +1020,12 @@ fn check_loss_of_sign(cx: &LateContext<'_, '_>, expr: &Expr, op: &Expr, cast_fro
         }
     }
 
-    // don't lint for the result of `abs`
+    // don't lint for the result of `abs` & `checked_abs`
     // `abs` is an inherent impl of `i{N}`, so a method call with ident `abs` will always
     // resolve to that spesific method
     if_chain! {
         if let ExprKind::MethodCall(ref path, _, _) = op.kind;
-        if path.ident.name.as_str() == "abs";
-        then {
-            return
-        }
-    }
-
-    // don't lint for the result of `checked_abs`
-    if_chain! {
-        if let ExprKind::MethodCall(ref path, _, _) = op.kind;
-        if path.ident.name.as_str() == "checked_abs";
+        if ["abs", "checked_abs"].contains(path.ident.name);
         then {
             return
         }