staging: usbip: simplified cleanup function
staging: usbip: simplified cleanup function

This patch simplified "stub_device_free" cleanup function:
 - changed return type to void, since the return value is
   not checked anywhere
 - kfree is NULL-safe, so removed if statement
 - deleted debug-message

Signed-off-by: Kurt Kanzenbach <234b2f4995133a48de628dff254bbf082bc671bc@cip.cs.fau.de>
Signed-off-by: Stefan Reif <f46b98d8e899b25255bead4bf43a06f060132ef7@cip.cs.fau.de>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs