uio: fix wrong return value from uio_mmap()

uio_mmap has multiple fail paths to set return value to nonzero then
goto out. However, it always returns *0* from the *out* at end, and
this will mislead callers who check the return value of this function.

Fixes: 57c5f4d ("uio: fix crash after the device is unregistered")
CC: Xiubo Li <[email protected]>
Signed-off-by: Hailong Liu <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Jiang Biao <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Hailong Liu

drivers/uio/uio.c

@@ -813,7 +813,7 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 
 out:
 	mutex_unlock(&idev->info_lock);
-	return 0;
+	return ret;
 }
 
 static const struct file_operations uio_fops = {