Fixed comment in filesystem test program.
diff --git a/test/testfilesystem.c b/test/testfilesystem.c
index 6b356a8..43b535c 100644
--- a/test/testfilesystem.c
+++ b/test/testfilesystem.c
@@ -9,7 +9,7 @@
including commercial applications, and to alter it and redistribute it
freely.
*/
-/* Simple test of power subsystem. */
+/* Simple test of filesystem functions. */
#include <stdio.h>
#include "SDL.h"