Name
hsi_alloc_msg — 
     Allocate an HSI message
 
Arguments
- nents
- 
     Number of memory entries
     
- flags
- 
     Kernel allocation flags
     
Description
   nents can be 0. This mainly makes sense for read transfer.
   In that case, HSI drivers will call the complete callback when
   there is data to be read without consuming it.
   
   Return NULL on failure or a pointer to an hsi_msg on success.