USB: Don't use __module_param_call

Found this when I changed args to __module_param_call.  We now have
core_param for exactly this, but Greg assures me "nousb" is used as a
module parameter, using the method suggested in moduleparam.h will
have to do.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Pete Zaitcev <zaitcev@redhat.com>
---
 drivers/usb/core/usb.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -962,9 +962,6 @@ void usb_buffer_unmap_sg(const struct us
 }
 EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg);
 
-/* format to disable USB on kernel command line is: nousb */
-__module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444);
-
 /*
  * for external read access to <nousb>
  */
@@ -1052,6 +1049,11 @@ static void __exit usb_exit(void)
 	ksuspend_usb_cleanup();
 }
 
+/* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */
+#undef MODULE_PARAM_PREFIX
+#define MODULE_PARAM_PREFIX
+module_param(nousb, bool, 0444);
+
 subsys_initcall(usb_init);
 module_exit(usb_exit);
 MODULE_LICENSE("GPL");
