exynos4-is: Add the FIMC-IS ISP capture DMA driver

Hello Sylwester Nawrocki,

The patch 34947b8aebe3: "[media] exynos4-is: Add the FIMC-IS ISP capture DMA driver" from Dec 20, 2013, leads to the following static checker warning:

drivers/media/platform/exynos4-is/fimc-isp-video.c:415 isp_video_try_fmt_mplane()
error: XXX NULL dereference inside function. '()' '0'

drivers/media/platform/exynos4-is/fimc-isp-video.c
390 static void __isp_video_try_fmt(struct fimc_isp *isp,
391 struct v4l2_pix_format_mplane *pixm,
392 const struct fimc_fmt **fmt)
393 {
394 *fmt = fimc_isp_find_format(&pixm->pixelformat, NULL, 2);
395

   396          pixm->colorspace = V4L2_COLORSPACE_SRGB;
   397          pixm->field = V4L2_FIELD_NONE;
   398          pixm->num_planes = (*fmt)->memplanes;
   399          pixm->pixelformat = (*fmt)->fourcc;
   400          /*
   401           * TODO: double check with the docmentation these width/height
   402           * constraints are correct.
   403           */
   404          v4l_bound_align_image(&pixm->width, FIMC_ISP_SOURCE_WIDTH_MIN,
   405                                FIMC_ISP_SOURCE_WIDTH_MAX, 3,
   406                                &pixm->height, FIMC_ISP_SOURCE_HEIGHT_MIN,
   407                                FIMC_ISP_SOURCE_HEIGHT_MAX, 0, 0);
   408  }
   409  
   410  static int isp_video_try_fmt_mplane(struct file *file, void *fh,
   411                                          struct v4l2_format *f)
   412  {
   413          struct fimc_isp *isp = video_drvdata(file);
   414  
   415          __isp_video_try_fmt(isp, &f->fmt.pix_mp, NULL);
                                                         ^^^^

This will just NULL deref. What was intended?

416 return 0;
417 }

regards,
dan carpenter