Fixes for kernel of FreeBSD:

* grub/asmstub.c (get_diskinfo): Toggle "kern.geom.debugflags" sysctl
        before opening a device for writing.
        * util/grub-install.in: Devices don't have this "r" prefix anymore.

util/grub-install.in

@@ -112,8 +112,8 @@ convert () {
 	tmp_disk=`echo "$1" | sed 's%\([sh]d[0-9]*\).*%\1%'`
 	tmp_part=`echo "$1" | sed "s%$tmp_disk%%"` ;;
     freebsd* | kfreebsd*-gnu)
-	tmp_disk=`echo "$1" | sed 's%r\{0,1\}\([saw]d[0-9]*\).*$%r\1%' \
-			    | sed 's%r\{0,1\}\(da[0-9]*\).*$%r\1%'`
+	tmp_disk=`echo "$1" | sed 's%r\{0,1\}\([saw]d[0-9]*\).*$%\1%' \
+			    | sed 's%r\{0,1\}\(da[0-9]*\).*$%\1%'`
 	tmp_part=`echo "$1" \
 	    | sed "s%.*/r\{0,1\}[saw]d[0-9]\(s[0-9]*[a-h]\)%\1%" \
        	    | sed "s%.*/r\{0,1\}da[0-9]\(s[0-9]*[a-h]\)%\1%"`