checkpatch: don't warn about extra parentheses in staging/

This "Unnecessary parentheses" warning is disabled for drivers/staging
unless the --strict option is used.  Really, we don't want it at all even
if the --strict option is used.

Link: https://lkml.kernel.org/r/c7278d21-d96c-4c1e-b3bf-f82b8decc5df@stanley.mountain


Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Joe Perches <joe@perches.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>