xen/hvc: Fix error cases around HVM_PARAM_CONSOLE_PFN

commit a32c88b9 upstream.

We weren't resetting the parameter to be passed in to a
known default. Nor were we checking the return value of
hvm_get_parameter.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/hvc/hvc_xen.c

@@ -219,7 +219,8 @@ static int xen_hvm_console_init(void)
 	if (r < 0)
 		goto err;
 	info->evtchn = v;
-	hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
+	v = 0;
+	r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
 	if (r < 0)
 		goto err;
 	mfn = v;