Description: Fix a NULL-ptr-deref bug in ath10k_usb_alloc_urb_from_pipe
References:
 https://lore.kernel.org/linux-wireless/20190804003101.11541-1-benquike@gmail.com/T/#u
Notes:
 bwh> Introduced in 4.14 by commit 4db66499df91 "ath10k: add initial USB
 bwh> support".
Bugs:
upstream: released (5.5-rc1) [bfd6e6e6c5d2ee43a3d9902b36e01fc7527ebb27]
4.19-upstream-stable: released (4.19.87) [f0cfe98332d650f31b462207d63c496b4cedaee2]
4.9-upstream-stable: N/A "Vulnerable code not present"
3.16-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.3.15-1)
4.19-buster-security: released (4.19.87-1)
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"