add braces around if block

dune/tectonic/data-structures/friction/localfriction.hh

@@ -61,9 +61,10 @@ class WrappedScalarFriction : public LocalFriction<dimension> {
 
   double regularity(VectorType const &x) const override {
     auto tangential_x = removeNormal(x);
-    double const xnorm = tangential_x.two_norm();
-    if (xnorm < 0.0)
-      return std::numeric_limits<double>::infinity();
+    double xnorm = tangential_x.two_norm();
+    if (xnorm < 0.0) {
+        return std::numeric_limits<double>::infinity();
+    }
 
     return func_.regularity(xnorm);
   }