oprofile: Fix oprofile_timer_exit() breakage

Removing remainings of oprofile_timer_exit() completly.

Signed-off-by: Robert Richter <robert.richter@amd.com>

arch/s390/oprofile/init.c

@@ -171,7 +171,6 @@ static int oprofile_hwsampler_init(struct oprofile_operations *ops)
 
 static void oprofile_hwsampler_exit(void)
 {
-	oprofile_timer_exit();
 	hwsampler_shutdown();
 }