coresight: Get parent device reference after sink ID map allocation

coresight: Get parent device reference after sink ID map allocation

The parent device's reference count is incremented before allocating the
sink ID map.  If the allocation fails, the reference count is not
decremented, preventing proper cleanup.

Fix this by incrementing the reference count only after the sink ID map
is successfully allocated.

Fixes: 5ad628a76176 ("coresight: Use per-sink trace ID maps for Perf sessions")
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260209-arm_coresight_refactor_dev_register-v4-2-62d6042f76f7@arm.com