staging: android: ion: tegra: Replace IS_ERR_OR_NULL with IS_ERR

Replace IS_ERR_OR_NULL test with an IS_ERR test since
ion_device_create() function returns a valid device or a -PTR_ERR
only as evidenced by the comment on the function prototype.
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/tegra/tegra_ion.c

@@ -37,7 +37,7 @@ static int tegra_ion_probe(struct platform_device *pdev)
 			     sizeof(struct ion_heap *), GFP_KERNEL);
 
 	idev = ion_device_create(NULL);
-	if (IS_ERR_OR_NULL(idev))
+	if (IS_ERR(idev))
 		return PTR_ERR(idev);
 
 	/* create the heaps as specified in the board file */