Fix for GDB bug #1948. Internally, this fixes a bad check in

remote_xfer_partial(), notably for AVR-GDB this makes the command
"info io_registers" work again.

devel/avr-gdb/Makefile

@@ -7,6 +7,7 @@
 
 PORTNAME=	gdb
 PORTVERSION=	6.3
+PORTREVISION=	1
 CATEGORIES=	devel
 MASTER_SITES=	${MASTER_SITE_SOURCEWARE}
 MASTER_SITE_SUBDIR=	gdb/releases

devel/avr-gdb/files/patch-gdb::remote.c

@@ -0,0 +1,15 @@
+--- remote.c.orig	Sat Nov  6 00:38:25 2004
++++ remote.c	Tue May 24 21:34:59 2005
+@@ -4895,8 +4895,10 @@
+ 	return -1;
+     }
+ 
+-  /* Only handle reads.  */
+-  if (writebuf != NULL || readbuf == NULL)
++  /* Only handle reads.  Zero OFFSET and LENGTH is just a size
++   * query only, so allow it anyway.  */
++  if ((writebuf != NULL || readbuf == NULL) &&
++      !(offset == 0 && len == 0))
+     return -1;
+ 
+   /* Map pre-existing objects onto letters.  DO NOT do this for new