[MINOR] use non-inline tv_* functions in many locations

The __tv_* functions were abused. They are not that small and it is not
always worth using them.
diff --git a/src/appsession.c b/src/appsession.c
index 0307ff7..72b7e40 100644
--- a/src/appsession.c
+++ b/src/appsession.c
@@ -143,7 +143,7 @@
 				for (element = list_head(&htbl->table[i]);
 				     element != NULL; element = list_next(element)) {
 					asession = (appsess *)list_data(element);
-					if (__tv_isle(&asession->expire, &now)) {
+					if (tv_isle(&asession->expire, &now)) {
 						if ((global.mode & MODE_DEBUG) &&
 						    (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
 							int len;
@@ -165,7 +165,7 @@
 						}
 						else
 							element = last;
-					}/* end if (__tv_isle(&asession->expire, &now)) */
+					}/* end if (tv_isle(&asession->expire, &now)) */
 					else
 						last = element;
 				}/* end  for (element = list_head(&htbl->table[i]); element != NULL; element = list_next(element)) */