[PATCH 4.4 63/67] usb: f_fs: Prevent gadget unbind if it is already unbound

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Hemant Kumar commit ce5bf9a50daf2d9078b505aca1cea22e88ecb94a upstream. Upon usb composition switch there is possibility of ep0 file release happening after gadget

[PATCH 4.4 63/67] usb: f_fs: Prevent gadget unbind if it is already unbound

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Hemant Kumar commit ce5bf9a50daf2d9078b505aca1cea22e88ecb94a upstream. Upon usb composition switch there is possibility of ep0 file release happening after gadget driver bind. In case of