staging: unisys: visorbus: remove EXPORT_SYMBOL_GPL for visor_check_channel

Removing EXPORT_SYMBOL_GPU from visor_check_channel since it is
used only in visorbus.

Signed-off-by: Sameer Wadgaonkar <sameer.wadgaonkar@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorbus/visorbus_main.c

@@ -116,7 +116,6 @@ int visor_check_channel(struct channel_header *ch,
 	}
 	return 1;
 }
-EXPORT_SYMBOL_GPL(visor_check_channel);
 
 static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env)
 {