A core dump issue in __connect_part_one function

 Hi, Nick:

    Sorry for interrupting you!
    
    When I using unixODBC, there will be core dump sometimes. The cause is in __connect_part_one and __connect_part_two functions:
    
    if ( !(connection -> dl_handle = odbc_dlopen( driver_lib )))
        {
            char txt[ 2048 ];

            sprintf( txt, "Can't open lib '%s' : %s",
                    driver_lib, lt_dlerror());
            ......
         }
         
         The lt_dlerror() return value is NULL.
         
         Because lt_dlerror() can return NULL, I think we should justify the return value of lt_dlerror before using sprintf.
         
         BTW, I think LT__GETERROR and LT__SETERRORSTR are not thread-safe, so the return value of lt_dlerror can be NULL.
 
Best Regards
Nan Xiao

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