Gilles DOFFE 892370121d
cpu/stm32/qdec: test null callback pointer (#14125)
cpu/stm32/qdec: test if callback pointer is set

Callback pointer is not tested and could result in a hard fault
if the pointer is NULL.
Thus only activate interrupt if a callback provided.

Signed-off-by: Gilles DOFFE <g.doffe@gmail.com>
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