[dynmatrixtest]

Add excplicit cast from double literal 0.5 to field_type to avoid Clang warnings.

[[Imported from SVN: r7034]]

dune/common/test/dynmatrixtest.cc

@@ -155,9 +155,9 @@ void test_mult(DynamicMatrix<K>& A,
   A.mmv(v,f);
   A.mmtv(f,v);
   A.mmhv(f,v);
-  A.usmv(0.5,v,f);
-  A.usmtv(0.5,f,v);
-  A.usmhv(0.5,f,v);
+  A.usmv((K)0.5,v,f);
+  A.usmtv((K)0.5,f,v);
+  A.usmhv((K)0.5,f,v);
 }