staging: comedi: comedi_fops: use kzalloc in comedi_alloc_subdevice_minor()

The hardware_device member of comedi_file_info is not set in this
function. Use kzalloc to make sure this pointer does not contain
invalid data.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi_fops.c

@@ -2376,8 +2376,8 @@ int comedi_alloc_subdevice_minor(struct comedi_device *dev,
 	struct device *csdev;
 	unsigned i;
 
-	info = kmalloc(sizeof(*info), GFP_KERNEL);
-	if (info == NULL)
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
 		return -ENOMEM;
 	info->device = dev;
 	info->read_subdevice = s;