clk: qcom: gdsc-regulator: Fix using uninitialized variable

Fix printing stale regval value in case of votable gdsc and if driver
observes error is gdsc polling.

Change-Id: I20c6e28fa8ed9ca5eea9f2a4c57b22c424ee262a
Signed-off-by: Vivek Aknurwar <viveka@codeaurora.org>