- update to 1.3.7
   librtas allocates buffer space (required for RTAS call) in the 
    RTAS private     memory area through sc_get_rmo_buffer() which 
    internally allocates memory     and protects it by acquiring 
    lock on the allocated memory area.
    
    Locking function :
     At present acquire_file_lock() tries to lock the particular 
    memory area. If the memory area is already locked then it 
    returns error without retrying.
    
    So when two process executes rtas call simultaneously one fails 
    with "Unknown librtas I/O" error.
    
    This patch introduces "Wait for lock to be available" instead 
    of returning with IO error.
    
- fixed minor memory leak in librtas.so

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