Commits on Mar 25, 2020

1. Fix HID device open failure handling …

   When the ACM device could be opened to restart into the bootloader, but
   the HID device was detected but failed to open (for example because of a
   permission problem), this would not be detected and the code would
   segfault because `handle` was NULL.
   
   The code that was supposed to handle a NULL return value from `hid_open`
   actually triggered only on a *non-null* value, and apparently also only
   when the "looking for hid device" loop above had reached i = 10 (in
   which case some error handling above would have bailed out already).
   
   This changes the code to just check for a NULL return value, and bail
   out in that case.

   

   matthijskooijman committed Mar 25, 2020
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