The ath11k_ce_alloc_ring() function returns error pointers on error, not
NULL. The rest of the driver assumes that "pipe->src_ring" is either
valid or NULL so this patch introduces a temporary varaible to avoid
leaving it as an error pointer.
Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>