Move if condiction from then block out.

Author: xiongmao86

clippy_lints/src/into_instead_of_from.rs

@@ -37,15 +37,14 @@ impl LateLintPass<'tcx> for IntoInsteadOfFrom {
                 if_chain! {
                     if let Some(tr_ref) = wbp.bounds[0].trait_ref();
                     if let Some(def_id) = tr_ref.trait_def_id();
+                    if cx.tcx.is_diagnostic_item(sym::from_trait, def_id);
                     then {
-                        if cx.tcx.is_diagnostic_item(sym::from_trait, def_id) {
-                            span_lint(
-                                cx,
-                                INTO_INSTEAD_OF_FROM,
-                                wp.span(),
-                                "What is WHERE PREDICATE"
-                            );
-                        }
+                        span_lint(
+                            cx,
+                            INTO_INSTEAD_OF_FROM,
+                            wp.span(),
+                            "What is WHERE PREDICATE"
+                        );
                     }
                 }
             },