[media] drivers/media/radio/si4713-i2c.c: removes unnecessary semicolon

removes unnecessary semicolon
Found by Coccinelle: http://coccinelle.lip6.fr/



Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>