Merge pull request #230 from anonymouspage/isdigit-does-not-return-one

isdigit() may return any non-zero result for success

src/cdmriddir.cpp

@@ -152,7 +152,7 @@ bool CDmridDir::IsValidDmrid(const char *sz)
         ok = true;
         for ( size_t i = 0; (i < n) && ok; i++ )
         {
-            ok &= ::isdigit(sz[i]);
+            ok = ::isdigit(sz[i]);
         }
     }
     return ok;