Potential bug in the calculation of lost hits

[achim1]

In tof_event.rs

   188   pub fn get_lost_hits(&self) -> u16 {
   189     let mut lost_hits = 0u16;
   190     for rbev in &self.rb_events {
   191       if rbev.header.drs_lost_trigger() {
   192         let mut nhits = rbev.header.get_nchan() as u16;
   193         // FIXME - I don't understand this - that would only work if the RB 
   194         // sees 2 channels, that is 1 hit (?) Potential bug
   195         if nhits > 0 {
   196           nhits -= 1;
   197         }                                                                  
   198         lost_hits += nhits;                                                
   199       }                                                                    
   200     }                                                                      
   201     lost_hits                                                              
   202   }