Extract might_have_negative_value() function

clippy_lints/src/modulo_arithmetic.rs

@@ -51,6 +51,10 @@ fn is_negative<'a, 'tcx>(c: &ptr::P<rustc::hir::Expr>, cx: &LateContext<'a, 'tcx
     None
 }
 
+fn might_have_negative_value(t: &ty::TyS<'_>) -> bool {
+    (t.is_integral() && t.is_signed()) || t.is_floating_point()
+}
+
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ModuloArithmetic {
     fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
         match &expr.kind {
@@ -79,8 +83,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ModuloArithmetic {
                     } else {
                         // Operands are not consts, fallback to the 'might have different signs' lint
                         let lhs_type = cx.tables.expr_ty(lhs);
-                        if (lhs_type.is_integral() && lhs_type.is_signed()) || lhs_type.is_floating_point() {
-                            // Extract method
+                        if might_have_negative_value(lhs_type) {
                             span_help_and_lint(
                                 cx,
                                 MODULO_ARITHMETIC,