media: verisilicon: replace snprintf with strscpy+strlcat

Fixes this warning:

drivers/media/platform/verisilicon/hantro_drv.c: In function 'hantro_add_func':
drivers/media/platform/verisilicon/hantro_drv.c:902:49: warning: '%s' directive output may be truncated writing up to 127 bytes into a region of size 64 [-Wformat-truncation=]
  902 |         snprintf(vfd->name, sizeof(vfd->name), "%s-%s", match->compatible,
      |                                                 ^~
drivers/media/platform/verisilicon/hantro_drv.c:902:9: note: 'snprintf' output between 5 and 132 bytes into a destination of size 64
  902 |         snprintf(vfd->name, sizeof(vfd->name), "%s-%s", match->compatible,
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  903 |                  funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER ? "enc" : "dec");
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/media/platform/verisilicon/hantro_drv.c:902:49: warning: '%s' directive output may be truncated writing up to 127 bytes into a region of size 64 [-Wformat-truncation=]
  902 |         snprintf(vfd->name, sizeof(vfd->name), "%s-%s", match->compatible,
      |                                                 ^~
drivers/media/platform/verisilicon/hantro_drv.c:902:9: note: 'snprintf' output between 5 and 132 bytes into a destination of size 64
  902 |         snprintf(vfd->name, sizeof(vfd->name), "%s-%s", match->compatible,
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  903 |                  funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER ? "enc" : "dec");
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/verisilicon/hantro_drv.c

@@ -899,8 +899,9 @@ static int hantro_add_func(struct hantro_dev *vpu, unsigned int funcid)
 	vfd->vfl_dir = VFL_DIR_M2M;
 	vfd->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
 	vfd->ioctl_ops = &hantro_ioctl_ops;
-	snprintf(vfd->name, sizeof(vfd->name), "%s-%s", match->compatible,
-		 funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER ? "enc" : "dec");
+	strscpy(vfd->name, match->compatible, sizeof(vfd->name));
+	strlcat(vfd->name, funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER ?
+		"-enc" : "-dec", sizeof(vfd->name));
 
 	if (funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER) {
 		vpu->encoder = func;