sysutils/mbgtools: Add error checking for copyin() and copyout() calls

This will be required soon, and the previous lack of such error handling
was a bug.

PR:		275986
Approved by:	antoine

sysutils/mbgtools/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	mbgtools
 DISTVERSION=	fbsd-1.0.0
+PORTREVISION=	1
 CATEGORIES=	sysutils
 MASTER_SITES=	http://www.meinberg.de/download/drivers/
 

sysutils/mbgtools/files/patch-mbglib_common_macioctl.h

@@ -0,0 +1,17 @@
+--- mbglib/common/macioctl.h.orig	2024-01-02 18:05:57 UTC
++++ mbglib/common/macioctl.h
+@@ -259,10 +259,12 @@ typedef struct
+     memcpy( _piob, _pin, _size )
+ 
+   #define _frc_iob_to_pout( _piob, _pout, _size ) \
+-    copyout( _piob, _pout, _size )
++    if (copyout( _piob, _pout, _size ) != 0) \
++      goto err_inval
+ 
+   #define _frc_iob_from_pin( _piob, _pin, _size ) \
+-    copyin( _pin, _piob, _size )
++    if (copyin( _pin, _piob, _size ) != 0) \
++      goto err_inval
+ 
+   #define _io_wait_pcps_sec_change( _pddev, _cmd, _type, _pout ) \
+     goto err_inval