Rename tbf_alloc_ul_tbf -> ul_tbf_alloc

Use proper prefix according to the type being allocated.

Change-Id: Ic98c3c852c96c3f52f1c8f531b8d0fd28ce5aef5
diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index 91d1f07..96fede7 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -131,7 +131,7 @@
 	OSMO_ASSERT(ms_dl_tbf(ms) == dl_tbf);
 	OSMO_ASSERT(dl_tbf->ms() == ms);
 
-	gprs_rlcmac_tbf *ul_tbf = tbf_alloc_ul_tbf(bts,
+	gprs_rlcmac_tbf *ul_tbf = ul_tbf_alloc(bts,
 						   ms, 0, false);
 	OSMO_ASSERT(ul_tbf != NULL);
 	ul_tbf->update_ms(0x2342, GPRS_RLCMAC_UL_TBF);