on_each_cpu(): kill unused 'retry' parameter

It's not even passed on to smp_call_function() anymore, since that
was removed. So kill it.

Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index 564daaa..eaa1a35 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -1249,7 +1249,7 @@
 
 void global_cache_flush(void)
 {
-	if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
+	if (on_each_cpu(ipi_handler, NULL, 1) != 0)
 		panic(PFX "timed out waiting for the other CPUs!\n");
 }
 EXPORT_SYMBOL(global_cache_flush);