xpp: clean 'Extrainfo' EEPROM field

* Extrainfo field contains junk data
* Caused by:
  - The field is initialized to 0xFF values
  - There was no null termination (and no room to add it)
* New code:
  - Ensure that show_extrainfo() have null termination even if EEPROM
    field is full.
  - Replace trailing 0xFF characters with '\0' when reading this field
  - Since our default burned EEPROM contain Extrainfo field full of
    0xFF characters, this would make them look as null filled.

Internal Issue-Id: #1341
Signed-off-by: Oron Peled <oron.peled@xorcom.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Origin: http://svnview.digium.com/svn/dahdi?view=rev&rev=10491

git-svn-id: http://svn.asterisk.org/svn/dahdi/tools/branches/2.6@10515 a0bf4364-ded3-4de4-8d8a-66a801d63aff

1 files changed, 1 insertions, 1 deletions

diff --git a/xpp/mpp.h b/xpp/mpp.h
index 23a0ce9..e6b8e3a 100644
--- a/xpp/mpp.h
+++ b/xpp/mpp.h
@@ -83,7 +83,7 @@ struct capkey {
 } PACKED;
 
 struct extrainfo {
-	char		text[24];
+	char		text[EXTRAINFO_SIZE];
 } PACKED;
 
 struct mpp_header {