tbf: Fix typos in log messages concerning UL/DL

The TBF in create_dl_ass can be of any direction. The text in
rcv_resource_request uses DL instead of UL.

Sponsored-by: On-Waves ehf
diff --git a/src/bts.cpp b/src/bts.cpp
index cb1c585..5b62a18 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -935,7 +935,7 @@
 		if (ul_tbf) {
 			LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
 				"TLLI=0x%08x while %s still "
-				"exists. Killing pending DL TBF\n",
+				"exists. Killing pending UL TBF\n",
 				tlli, tbf_name(ul_tbf));
 			tbf_free(ul_tbf);
 			ul_tbf = NULL;