Correction to function prototype

Flagged by cppcheck static analysis.
Tagged as Picker-0_56-1 as no net code change.

Support011/h/icon

@@ -42,7 +42,7 @@
   * value at a distance of |mul| between them.
   */
 
-extern int icon_ratio (int x0, int x1, int mul, int max, int min);
+extern int icon_ratio (int x0, int x1, int mul, int min, int max);
 
  /* Macro to do the same - take your pick!
   */