[media] go7007: dubious one-bit signed bitfields

Because they're signed, "is_video" and "is_audio" can be 0 and -1
instead of 0 and 1 as intended.  It doesn't cause a bug, but it makes
Sparse complain:
drivers/staging/media/go7007/go7007-priv.h:94:31: error: dubious one-bit signed bitfield
drivers/staging/media/go7007/go7007-priv.h:95:31: error: dubious one-bit signed bitfield
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/media/go7007/go7007-priv.h

@@ -91,8 +91,8 @@ struct go7007_board_info {
 	int num_i2c_devs;
 	struct go_i2c {
 		const char *type;
-		int is_video:1;
-		int is_audio:1;
+		unsigned int is_video:1;
+		unsigned int is_audio:1;
 		int addr;
 		u32 flags;
 	} i2c_devs[5];