UPSTREAM: ath10k: handle resource init failure case

Return type of resource init method is not assigned.
Handle resource init failures for graceful exit.

Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Git-commit: d16a7ab20ac9861979c83d7fce8f5edc48daada6
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


Change-Id: Iea5367f7664399c178b5749f7f9f46d7730ec6d3
Signed-off-by: Dundi Raviteja <dundi@codeaurora.org>