msm: ipa: return error on channel setup failure

Return the correct error code when channel setup fails due
to memory allocation.

Change-Id: If345299532f8d04a543e3c7e535d4a7987661d0e
CRs-Fixed: 2028360
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>