tm branches: Few quickfixes

Author: liviuchircu

dset.c

@@ -293,6 +293,8 @@ int append_msg_branch(struct msg_branch *branch)
 			LM_ERR("oom 2\n");
 			return E_OUT_OF_MEM;
 		}
+		memset((char *)new_br + idx * sizeof *new_br, 0,
+				DSET_INCREMENT * sizeof *new_br);
 
 		dsct->branches = new_br;
 	}

modules/tm/t_fwd.c

@@ -432,8 +432,10 @@ static int add_uac( struct cell *t, struct sip_msg *request, const str *uri,
 	 * Bottom line, we take over the attr list handling, so we NULL the
 	 * received holder (so the upper level will havve nothing to care furhter)
 	 */
-	t->uac[branch].battrs = *attrs;
-	*attrs = NULL;
+	if (attrs) {
+		t->uac[branch].battrs = *attrs;
+		*attrs = NULL;
+	}
 
 	if ( pre_print_uac_request( t, branch, request, &body_clone)!= 0 ) {
 		ret = -1;