Remove unused code by lcov

Author: wangbin579

pairs.c

@@ -103,12 +103,3 @@ retrieve_mysql_user_pwd_info(tc_pool_t *pool, char *pairs)
     return 0;
 }
 
-
-void
-release_mysql_user_pwd_info()
-{
-    if (user_pwd_table != NULL) {
-        user_pwd_table = NULL;
-    }
-}
-

pairs.h

@@ -12,7 +12,6 @@ typedef struct mysql_user{
 
 char *retrieve_user_pwd(char *user);
 int retrieve_mysql_user_pwd_info(tc_pool_t *, char *);
-void release_mysql_user_pwd_info();
 
 #endif