sprintf buf size +1 for null char terminating string

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5293 818b1a75-f10b-46b9-bf7c-635c3b92a50f

openair-cn/SGW-LITE/sgw_lite_ie_defs.h

@@ -120,7 +120,7 @@ typedef struct {
         (imsi)->digit[14]
 
 typedef struct {
-    uint8_t digit[IMSI_DIGITS_MAX];
+    uint8_t digit[IMSI_DIGITS_MAX+1]; // +1 for '\0` macro sprintf changed in snprintf
     uint8_t length;
 } Imsi_t;