ICU-4268 Don't use // in C files.

X-SVN-Rev: 17852

icu4c/source/test/cintltst/cucdtst.c

@@ -1681,7 +1681,7 @@ TestCharNames() {
                 uset_add,
                 uset_addRange,
                 uset_addString,
-                NULL // don't need remove()
+                NULL /* don't need remove() */
             };
             sa.set=set;
             uprv_getCharNameCharacters(&sa);