media: si4713: remove trailing semicolon in macro definition

The macro use will already have a semicolon.

[hverkuil: also add () around p in the macro]

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>