[SCSI] zfcp: Introduce a helper function that dumps hex data to a zfcp trace.

#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_OTHER

static void zfcp_dbf_hexdump(debug_info_t *dbf, void *to, int to_len,

			     int level, char *from, int from_len)

{

	int offset;

	struct zfcp_dbf_dump *dump = to;

	int room = to_len - sizeof(*dump);

	for (offset = 0; offset < from_len; offset += dump->size) {

		memset(to, 0, to_len);

		strncpy(dump->tag, "dump", ZFCP_DBF_TAG_SIZE);

		dump->total_size = from_len;

		dump->offset = offset;

		dump->size = min(from_len - offset, room);

		memcpy(dump->data, from + offset, dump->size);

		debug_event(dbf, level, dump, dump->size);

	}

}

static int

zfcp_dbf_stck(char *out_buf, const char *label, unsigned long long stck)

{