we need a new pinfo member field so that we can pass data from the core usb dissector to future class dissectors

svn path=/trunk/; revision=19576

epan/packet.c

@@ -316,6 +316,7 @@ dissect_packet(epan_dissect_t *edt, union wtap_pseudo_header *pseudo_header,
 	edt->pi.link_number = 0;
 	edt->pi.annex_a_used = MTP2_ANNEX_A_USED_UNKNOWN;
 	edt->pi.profinet_type = 0;
+        edt->pi.usb_conv_info = NULL;
 
 	TRY {
 		edt->tvb = tvb_new_real_data(pd, fd->cap_len, fd->pkt_len);

epan/packet_info.h

@@ -174,6 +174,7 @@ typedef struct _packet_info {
   guint16 link_number;
   gchar   annex_a_used;
   guint16 profinet_type; 	/* the type of PROFINET packet (0: not a PROFINET packet) */
+  void *usb_conv_info;
 } packet_info;
 
 #endif /* __PACKET_INFO_H__ */