msm: sps: Fix error case handling in probe function

Fix possible NULL pointer dereference in the probe
function by adding proper error case handling for
clk errors.

CRs-fixed: 583991
Change-Id: Ief54cc28487e5559a893fa2f4c57148e76bd1acb
Signed-off-by: Dipen Parmar <dipenp@codeaurora.org>