gstpad: Probes that return HANDLED can reset the data info field

Before GST_PAD_PROBE_HANDLED was introduced, we had to handle the case
where some probes would reset the probe info data field to NULL. This would
be considered an invalid use-case.

But with GST_PAD_PROBE_HANDLED it is totally fine to reset that, since
the probe has "handled" it.
18 jobs for probehandled in 75 minutes and 42 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Preparation
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gst indent

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manifest

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  Build
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build fedora x86_64

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build nodebug fedora x86_64

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check fedora

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integration testsuites fedora

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  Full Builds
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build cerbero android universal

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build cerbero cross win32

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build cerbero cross win64

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build cerbero fedora x86_64

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  Full Tests
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valgrind bad

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valgrind base

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valgrind core

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valgrind ges

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valgrind good

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  Apps
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android universal examples

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  Deploy
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documentation

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