v4l2object: update match_buffer_layout() debug messages

It's no longer used only to try importing buffers.
15 jobs for v4l2-import in 64 minutes and 22 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Preparation
passed #321748
gst indent

00:00:25

passed #321747
manifest

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  Build
passed #321749
build fedora x86_64

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passed #321750
build nodebug fedora x86_64

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  Test
passed #321751
check fedora

00:05:05

passed #321752
integration testsuites fedora

00:11:57

 
  Full Builds
passed #321754
build cerbero android universal

00:11:57

passed #321755
build cerbero cross win32

00:08:31

passed #321756
build cerbero cross win64

00:06:00

passed #321753
build cerbero fedora x86_64

00:06:59

 
  Full Tests
passed #321758
valgrind bad

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passed #321759
valgrind ges

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passed #321757
valgrind good

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  Apps
passed #321760
android universal examples

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  Deploy
passed #321761
documentation

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