drm/prime: replace NULL with error value in drm_prime_pages_to_sg

Instead of NULL, error value is casted with ERR_PTR() for
drm_prime_pages_to_sg() and IS_ERR_OR_NULL() macro is replaced
with IS_ERR() macro for drm_gem_map_dma_buf().

Signed-off-by: YoungJun Cho <[email protected]>
Signed-off-by: Seung-Woo Kim <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
1 file changed