identity: Non-live upstream have no max latency

sync=TRUE implementation changes the latency query of a non-live
upstream into live, though it wrongly set the upstream max latency to 0.
As non-live sources won't loose data if we wait longer, this should have
been reported as have no max latency limite (-1).
21 jobs for backport-mr-208-into-1.16-identity-max-latency in 57 minutes and 33 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Preparation
passed #489030
gst indent

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passed #489029
manifest

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  Build
passed #489036
build cerbero android universal

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passed #489037
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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passed #489040
gst-ios-12.2
build cerbero ios universal

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passed #489039
gst-macos-10.14
build cerbero macos x86_64

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passed #489031
build fedora x86_64

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passed #489032
build nodebug fedora x86_64

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passed #489033
build static fedora x86_64

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passed #489034
build static nodebug fedora x86_64

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  Test
passed #489041
check fedora

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passed #489042
integration testsuites fedora

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passed #489047
valgrind bad

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valgrind base

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valgrind core

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valgrind ges

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passed #489045
valgrind good

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valgrind ugly

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  Integrate
passed #489049
android universal examples

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