Probes fixes for v6.9-rc1:

 - tracing/probes: initialize a 'val' local variable with zero. This variable
   is read by FETCH_OP_ST_EDATA in a loop, and is expected to be initialized
   by FETCH_OP_ARG in the same loop. Since this expectation is not obvious,
   thus smatch warns it. Initializing 'val' with zero fixes this warning.
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