Fix spurious bug because class field was uninitialized. #1670
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This bug caused mavros to crash randomly. Is there maybe a check that can be enabled in g++ to catch these kind of bugs?
Rationale:
For basic types, fields get initialized with there default value, but struct types get garbled memory, unless passed an initializer list.
See also: https://en.cppreference.com/w/cpp/language/default_initialization