use auto type when assigning from cast or using new

src/fix_move.cpp

@@ -1218,7 +1218,7 @@ void FixMove::write_restart(FILE *fp)
 void FixMove::restart(char *buf)
 {
   int n = 0;
-  double *list = (double *) buf;
+  auto list = (double *) buf;
 
   time_origin = static_cast<int>(list[n++]);
 }