GSMTAP: Fix channel type for data blocks: PDTCH instead of PACCH

PACCH is used only for RLC/MAC control messages, while PDTCH is used
for data.

Change-Id: I6c912e17d8c8d4178096679a541e61eeeb4b6643
diff --git a/src/bts.cpp b/src/bts.cpp
index 5d1a500..2bafd63 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -1598,9 +1598,9 @@
 				cs.name());
 			return -EINVAL;
 		}
-		bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_EGPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len);
+		bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_EGPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn, data, data_len);
 	} else {
-		bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_GPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len);
+		bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_GPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn, data, data_len);
 	}
 
 	LOGP(DRLCMACUL, LOGL_DEBUG, "  UL data: %s\n", osmo_hexdump(data, len));