media: exynos4-is: remove a now unused integer

The usage of pm_runtime_resume_and_get() removed the need of a
temporary integer. So, drop it.

Fixes: 59f96244 ("media: exynos4-is: fix pm_runtime_get_sync() usage count")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>