fixed the use of unitialized variable - code now works on the test system

of one of our users which replicates from a live server. So I now have a
lot of confidence in it and will push. It passes all tests, so I if I broke
somebody's code in 3.23 merge this is your fault - you should have had a good test
case :-)

sql/slave.cc

@@ -361,6 +361,7 @@ int terminate_slave_thread(THD* thd, pthread_mutex_t* term_lock,
     abstime.tv_sec=tv.tv_sec+2;
     abstime.tv_nsec=tv.tv_usec*1000;
 #endif
+    DBUG_ASSERT(cond_lock->count > 0 && cond_lock->thread == pthread_self());
     pthread_cond_timedwait(term_cond, cond_lock, &abstime);
     if (*slave_running)
       KICK_SLAVE(thd);
@@ -947,7 +948,6 @@ int init_relay_log_info(RELAY_LOG_INFO* rli, const char* info_fname)
   int info_fd;
   const char* msg = 0;
   int error = 0;
-  
   fn_format(fname, info_fname,
 	    mysql_data_home, "", 4+32);
   pthread_mutex_lock(&rli->data_lock);

sql/slave.h

@@ -157,6 +157,7 @@ typedef struct st_relay_log_info
 		      log_pos_current(0)
     {
       relay_log_name[0] = master_log_name[0] = 0;
+      bzero(&info_file,sizeof(info_file));
       pthread_mutex_init(&run_lock, MY_MUTEX_INIT_FAST);
       pthread_mutex_init(&data_lock, MY_MUTEX_INIT_FAST);
       pthread_cond_init(&data_cond, NULL);
@@ -271,6 +272,7 @@ typedef struct st_master_info
   st_master_info():fd(-1), io_thd(0), inited(0), old_format(0)
   {
     host[0] = 0; user[0] = 0; password[0] = 0;
+    bzero(&file,sizeof(file));
     pthread_mutex_init(&run_lock, MY_MUTEX_INIT_FAST);
     pthread_mutex_init(&data_lock, MY_MUTEX_INIT_FAST);
     pthread_cond_init(&data_cond, NULL);