ldap: Fix possible buffer overflow

If gcc says "2050 chars can overflow a 2049 buffer", gcc is definitely
not wrong...

modules/ldap/iniparser.c

@@ -546,7 +546,7 @@ output file pointers.
 
 	/* iniparser.c.c following */
 #define ASCIILINESZ         1024
-#define LONGKEYBUFF         2*ASCIILINESZ+1
+#define LONGKEYBUFF         (2*ASCIILINESZ +1/*:*/ +1/*'\0'*/)
 #define INI_INVALID_KEY     ((char*)-1)
 
 	/* Private: add an entry to the dictionary */