phy: qcom-qmp: Initialize another pointer to NULL

This probe function is too complicated and should be refactored. For now
let's just set this variable to NULL and keep the static analysis tools
happy.

Fixes: 52e013d0

 ("phy: qcom-qmp: Add support for DP in USB3+DP combo phy")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20201026205942.2861828-1-swboyd@chromium.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>