format changes

src/COLVARS/fix_colvars.cpp

@@ -1000,7 +1000,7 @@ double FixColvars::compute_scalar()
 
 /* ---------------------------------------------------------------------- */
 /* local memory usage. approximately. */
-double FixColvars::memory_usage(void)
+double FixColvars::memory_usage()
 {
   double bytes = (double) (num_coords * (2*sizeof(int)+3*sizeof(double)));
   bytes += (double)(double) (nmax*size_one) + sizeof(this);