pdch: has_gprs_only_tb_attached: use m_num_tbfs

Make use of the separate GPRS counters added in previous patch
I0c0a1121b4ae5f031782e7e63a0c28eb0b6c8b42 to shorten
has_gprs_only_tb_attached.

Related: SYS#4878
Change-Id: I1dd7df2c740ea604f07c65bebcb7c0051aebf9ae

src/pdch.cpp

@@ -1114,18 +1114,8 @@ void gprs_rlcmac_pdch::detach_tbf(gprs_rlcmac_tbf *tbf)
 
 bool gprs_rlcmac_pdch::has_gprs_only_tbf_attached() const
 {
-	unsigned int i;
-	unsigned int j;
-	for (i = 0; i < sizeof(m_assigned_tfi[0]); i++) {
-		for (j = 0; j < 2; j++) {
-			if (m_assigned_tfi[j] & (1UL << i)) {
-				gprs_rlcmac_tbf *tbf = m_tbfs[j][i];
-				if (!tbf->is_egprs_enabled())
-					return true;
-			}
-		}
-	}
-	return false;
+	return (m_num_tbfs_gprs[GPRS_RLCMAC_UL_TBF] +
+		m_num_tbfs_gprs[GPRS_RLCMAC_DL_TBF]) > 0;
 }
 
 void gprs_rlcmac_pdch::reserve(enum gprs_rlcmac_tbf_direction dir)