[media] V4L2: soc-camera: fix uninitialised use compiler warning

In scan_async_group() if the size parameter is negative, the sasd pointer
will be used uninitialised:
drivers/media/platform/soc_camera/soc_camera.c: In function "soc_camera_host_register":
drivers/media/platform/soc_camera/soc_camera.c:1514:55: warning: "sasd" may
be used uninitialized in this function [-Wmaybe-uninitialized]
sasd->asd.match.i2c.adapter_id, sasd->asd.match.i2c.address);
^
drivers/media/platform/soc_camera/soc_camera.c:1464:34: note: "sasd" was
declared here
struct soc_camera_async_subdev *sasd;
Fix this by making "size" and the array, from which it is assigned unsigned.

Signed-off-by: Guennadi Liakhovetski <[e-mail]>
Acked-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/soc_camera/soc_camera.c

···
 }
 
 static int scan_async_group(struct soc_camera_host *ici,
-			    struct v4l2_async_subdev **asd, int size)
+			    struct v4l2_async_subdev **asd, unsigned int size)
 {
 	struct soc_camera_async_subdev *sasd;
 	struct soc_camera_async_client *sasc;

include/media/sh_mobile_ceu.h

···
 	int max_height;
 	struct sh_mobile_ceu_companion *csi2;
 	struct v4l2_async_subdev **asd;	/* Flat array, arranged in groups */
-	int *asd_sizes;			/* 0-terminated array pf asd group sizes */
+	unsigned int *asd_sizes;	/* 0-terminated array pf asd group sizes */
 };
 
 #endif /* __ASM_SH_MOBILE_CEU_H__ */

include/media/soc_camera.h

···
 	const char *drv_name;
 	struct soc_camera_host_ops *ops;
 	struct v4l2_async_subdev **asd;	/* Flat array, arranged in groups */
-	int *asd_sizes;			/* 0-terminated array of asd group sizes */
+	unsigned int *asd_sizes;	/* 0-terminated array of asd group sizes */
 };
 
 struct soc_camera_host_ops {