[evolution-activesync] connection: avoid NULL pointer passing/access

[Patrick Ohly <pohly src gnome org>]

commit c2948cf1393dc41923c8bb03d5a0ba546ef6d6d1
Author: Patrick Ohly <patrick ohly intel com>
Date:   Fri Aug 31 19:27:53 2012 +0000

    connection: avoid NULL pointer passing/access
    
    valgrind complained about NULL being passed to fwrite(). Probably
    happend in combination with an actual non-zero length parameter
    because of some network error - better check data pointer.

 eas-daemon/libeas/eas-connection.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/eas-daemon/libeas/eas-connection.c b/eas-daemon/libeas/eas-connection.c
index 9393bd7..52d58fe 100644
--- a/eas-daemon/libeas/eas-connection.c
+++ b/eas-daemon/libeas/eas-connection.c
@@ -2265,7 +2265,8 @@ write_response_to_file (const WB_UTINY* xml, WB_ULONG xml_len)
 	fullPath = g_strconcat (path, filename, NULL);
 
 	if ( (file = fopen (fullPath, "w"))) {
-		fwrite (xml, 1, xml_len, file);
+		if (xml)
+			fwrite (xml, 1, xml_len, file);
 		fclose (file);
 	}