msm: sps: Fix two uninitialized variable compiler warnings

 drivers/platform/msm/sps/sps_rm.c:233:27: error:
   'data_iova' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Change-Id: Ic0dedbad0eeeac6113327c20b47d954591c1418b
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>