media: venus: core: Fix error handling in probe

Post a successful pm_ops->core_get, an error in probe
should exit by doing a pm_ops->core_put which seems
to be missing. So fix it.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>