Fix build failure introduced by commit
7acc6197 (usb: musb: Idle path retention
and offmode support for OMAP3) when building without gadget
support.

  CC      drivers/usb/musb/omap2430.o
drivers/usb/musb/omap2430.c: In function ‘musb_otg_notifications’:
drivers/usb/musb/omap2430.c:262: error: ‘struct musb’ has no member named ‘gadget_driver’
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>