[PATCH] drm/exynos: fix compile error and warning of g2d

[Joonyoung Shim]

Should be !g2d_userptr->vec, not !vec. This will fix below compile
error.

drivers/gpu/drm/exynos/exynos_drm_g2d.c: In function 
‘g2d_userptr_get_dma_addr’:
drivers/gpu/drm/exynos/exynos_drm_g2d.c:465:7: error: ‘vec’ undeclared 
(first use in this function)
  if (!vec)

Also, if g2d_userptr->vec is NULL it should assign -ENOMEM in ret. It
will fix below compile warning.

drivers/gpu/drm/exynos/exynos_drm_g2d.c: In function 
‘exynos_g2d_set_cmdlist_ioctl’:
drivers/gpu/drm/exynos/exynos_drm_g2d.c:415:6: warning: ‘ret’ may be used 
uninitialized in this function [-Wmaybe-uninitialized]
  int ret;
      ^
Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_g2d.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c 
b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
index 810e1ee..7584834 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
@@ -462,8 +462,10 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct 
drm_device *drm_dev,
        end = PAGE_ALIGN(userptr + size);
        npages = (end - start) >> PAGE_SHIFT;
        g2d_userptr->vec = frame_vector_create(npages);
-       if (!vec)
+       if (!g2d_userptr->vec) {
+               ret = -ENOMEM;
                goto err_free;
+       }

        ret = get_vaddr_frames(start, npages, true, true, g2d_userptr->vec);
        if (ret != npages) {
-- 
1.9.1