InnoDB: Corrected typos in DBUG_ statements

sql/ha_innodb.cc:
  Corrected typos in DBUG_ statements

sql/ha_innodb.cc

@@ -3049,7 +3049,7 @@ ha_innobase::index_last(
 {
 	int	error;
 
-  	DBUG_ENTER("index_first");
+  	DBUG_ENTER("index_last");
   	statistic_increment(ha_read_last_count, &LOCK_status);
 
   	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);
@@ -4110,7 +4110,7 @@ ha_innobase::info(
 
         if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {
 
-                return;
+                DBUG_VOID_RETURN;
         }
 
 	/* We do not know if MySQL can call this function before calling