usb: gadget: Initialize spinlock before trying to use it
usb: gadget: Initialize spinlock before trying to use it

Initialize spinlock before using it to avoid BUG_ON message on
USB cable disconnect.

Change-Id: I40949ac631efdf7e50294af480cd3ae2a6be81f2
Signed-off-by: Manu Gautam <51907cac86db5f2ed57a4ac58c042ecc27c0b352@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas