mmc: cmdq_hci: Fix pm ref count handling on error scenarios

Runtime pm get/put calls need to be called in pairs. Fix the
unpaired call of runtime pm put after input validation.

Change-Id: Ice2ba1e4d17ffde48b2f4d59801bb962f2e9aae7
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>