staging: android: ion: dummy: fix an error code

We should be returning -ENOMEM here instead of zero.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/android/ion/ion_dummy_driver.c

···
 	heaps = kzalloc(sizeof(struct ion_heap *) * dummy_ion_pdata.nr,
 			GFP_KERNEL);
 	if (!heaps)
-		return PTR_ERR(heaps);
+		return -ENOMEM;
 
 
 	/* Allocate a dummy carveout heap */