[PATCH] staging: android: ion: fix err_cast.cocci warnings

[kbuild test robot]

From: kbuild test robot <lkp at intel.com>

drivers/staging/android/ion/ion.c:427:9-16: WARNING: ERR_CAST can be used with buffer


 Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...))

Generated by: scripts/coccinelle/api/err_cast.cocci

Fixes: d51f182d188a ("staging: android: ion: refactory ion_alloc for kernel driver use")
CC: Zeng Tao <prime.zeng at hisilicon.com>
Signed-off-by: kbuild test robot <lkp at intel.com>
---

url:    https://github.com/0day-ci/linux/commits/Zeng-Tao/staging-android-ion-refactory-ion_alloc-for-kernel-driver-use/20190330-071409

 ion.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -424,7 +424,7 @@ struct dma_buf *ion_alloc(size_t len, un
 		return ERR_PTR(-ENODEV);
 
 	if (IS_ERR(buffer))
-		return ERR_PTR(PTR_ERR(buffer));
+		return ERR_CAST(buffer);
 
 	exp_info.ops = &dma_buf_ops;
 	exp_info.size = buffer->size;